Use an iterator over OsString for uumain()

Additionally, restructure `uname` so that we don't need to find the
iterator's length.

build.rs

@@ -43,10 +43,10 @@ pub fn main() {
     let mut tf = File::create(Path::new(&out_dir).join("test_modules.rs")).unwrap();
 
     mf.write_all(
-        "type UtilityMap = HashMap<&'static str, fn(Vec<String>) -> i32>;\n\
+        "type UtilityMap<T> = HashMap<&'static str, fn(T) -> i32>;\n\
         \n\
-        fn util_map() -> UtilityMap {\n\
+        fn util_map<T: uucore::Args>() -> UtilityMap<T> {\n\
-        \tlet mut map: UtilityMap = HashMap::new();\n\
+        \tlet mut map = UtilityMap::new();\n\
         "
         .as_bytes(),
     )

src/bin/coreutils.rs

@@ -5,108 +5,112 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-extern crate lazy_static;
 extern crate textwrap;
 extern crate uucore;
 
-use lazy_static::lazy_static;
+use std::cmp;
 use std::collections::hash_map::HashMap;
-use std::io::Write;
+use std::ffi::OsString;
+use std::io::{self, Write};
+use std::path::{Path, PathBuf};
+use std::process;
 
-static VERSION: &str = env!("CARGO_PKG_VERSION");
+const VERSION: &str = env!("CARGO_PKG_VERSION");
-
-lazy_static! {
-    static ref BINARY_PATH: std::path::PathBuf = {
-        // support symlinks by using args[0], when possible, with fallback to current_exe()
-        match std::env::args().next() {
-            Some(ref s) if !s.is_empty() => std::path::PathBuf::from(s),
-            _ => std::env::current_exe().unwrap(),
-        }
-    };
-    static ref NAME: &'static str = &*BINARY_PATH.file_stem().unwrap().to_str().unwrap();
-}
 
 include!(concat!(env!("OUT_DIR"), "/uutils_map.rs"));
 
-fn usage(utils: &UtilityMap) {
+fn usage<T>(utils: &UtilityMap<T>, name: &str) {
-    println!("{} {} (multi-call binary)\n", *NAME, VERSION);
+    println!("{} {} (multi-call binary)\n", name, VERSION);
-    println!("Usage: {} [function [arguments...]]\n", *NAME);
+    println!("Usage: {} [function [arguments...]]\n", name);
     println!("Currently defined functions/utilities:\n");
     #[allow(clippy::map_clone)]
     let mut utils: Vec<&str> = utils.keys().map(|&s| s).collect();
     utils.sort();
     let display_list = utils.join(", ");
-    let width = std::cmp::min(textwrap::termwidth(), 100) - 4 * 2; // (opinion/heuristic) max 100 chars wide with 4 character side indentions
+    let width = cmp::min(textwrap::termwidth(), 100) - 4 * 2; // (opinion/heuristic) max 100 chars wide with 4 character side indentions
     println!(
         "{}",
         textwrap::indent(&textwrap::fill(&display_list, width), "    ")
     );
 }
 
+fn binary_path(args: &mut impl Iterator<Item = OsString>) -> PathBuf {
+    match args.next() {
+	Some(s) if !s.is_empty() => PathBuf::from(s),
+        _ => std::env::current_exe().unwrap(),
+    }
+}
+
+fn name(binary_path: &Path) -> &str {
+    binary_path.file_stem().unwrap().to_str().unwrap()
+}
+
 fn main() {
     uucore::panic::mute_sigpipe_panic();
 
     let utils = util_map();
-    let mut args: Vec<String> = uucore::args().collect();
+    let mut args = uucore::args_os();
 
-    let binary = &BINARY_PATH;
+    let binary = binary_path(&mut args);
-    let binary_as_util = binary.file_stem().unwrap().to_str().unwrap();
+    let binary_as_util = name(&binary);
 
     // binary name equals util name?
     if let Some(&uumain) = utils.get(binary_as_util) {
-        std::process::exit(uumain(args));
+        process::exit(uumain((vec![binary.into()].into_iter()).chain(args)));
     }
 
     // binary name equals prefixed util name?
     // * prefix/stem may be any string ending in a non-alphanumeric character
-    if let Some(util) = utils.keys().find(|util| {
+    let utilname =
-        binary_as_util.ends_with(*util)
+	if let Some(util) = utils.keys().find(|util| {
-            && !(&binary_as_util[..binary_as_util.len() - (*util).len()])
+            binary_as_util.ends_with(*util)
-                .ends_with(char::is_alphanumeric)
+		&& !(&binary_as_util[..binary_as_util.len() - (*util).len()])
-    }) {
+		.ends_with(char::is_alphanumeric)
-        // prefixed util => replace 0th (aka, executable name) argument
+	}) {
-        args[0] = (*util).to_owned();
+            // prefixed util => replace 0th (aka, executable name) argument
-    } else {
+	    Some(OsString::from(*util))
-        // unmatched binary name => regard as multi-binary container and advance argument list
+	} else {
-        args.remove(0);
+            // unmatched binary name => regard as multi-binary container and advance argument list
-    }
+	    args.next()
+	};
 
     // 0th argument equals util name?
-    if !args.is_empty() {
+    if let Some(util_os) = utilname {
-        let util = &args[0][..];
+	let util = util_os.as_os_str().to_string_lossy();
 
-        match utils.get(util) {
+        match utils.get(&util[..]) {
             Some(&uumain) => {
-                std::process::exit(uumain(args.clone()));
+                process::exit(uumain((vec![util_os].into_iter()).chain(args)));
             }
             None => {
-                if &args[0][..] == "--help" || &args[0][..] == "-h" {
+                if util == "--help" || util == "-h" {
                     // see if they want help on a specific util
-                    if args.len() >= 2 {
+                    if let Some(util_os) = args.next() {
-                        let util = &args[1][..];
+                        let util = util_os.as_os_str().to_string_lossy();
-                        match utils.get(util) {
+
+                        match utils.get(&util[..]) {
                             Some(&uumain) => {
-                                let code = uumain(vec![util.to_owned(), "--help".to_owned()]);
+                                let code = uumain((vec![util_os, OsString::from("--help")].into_iter()).chain(args));
-                                std::io::stdout().flush().expect("could not flush stdout");
+                                io::stdout().flush().expect("could not flush stdout");
-                                std::process::exit(code);
+                                process::exit(code);
                             }
                             None => {
                                 println!("{}: function/utility not found", util);
-                                std::process::exit(1);
+                                process::exit(1);
                             }
                         }
                     }
-                    usage(&utils);
+                    usage(&utils, binary_as_util);
-                    std::process::exit(0);
+                    process::exit(0);
                 } else {
                     println!("{}: function/utility not found", util);
-                    std::process::exit(1);
+                    process::exit(1);
                 }
             }
         }
     } else {
         // no arguments provided
-        usage(&utils);
+        usage(&utils, binary_as_util);
-        std::process::exit(0);
+        process::exit(0);
     }
 }

src/uu/arch/src/arch.rs

@@ -16,8 +16,8 @@ static SYNTAX: &str = "Display machine architecture";
 static SUMMARY: &str = "Determine architecture name for current machine.";
 static LONG_HELP: &str = "";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    app!(SYNTAX, SUMMARY, LONG_HELP).parse(args);
+    app!(SYNTAX, SUMMARY, LONG_HELP).parse(args.collect_str());
     let uts = return_if_err!(1, PlatformInfo::new());
     println!("{}", uts.machine().trim());
     0

src/uu/base32/src/base32.rs

@@ -23,6 +23,6 @@ static LONG_HELP: &str = "
  encoded stream.
 ";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    base_common::execute(args, SYNTAX, SUMMARY, LONG_HELP, Format::Base32)
+    base_common::execute(args.collect_str(), SYNTAX, SUMMARY, LONG_HELP, Format::Base32)
 }

src/uu/base64/src/base64.rs

@@ -24,6 +24,6 @@ static LONG_HELP: &str = "
  encoded stream.
 ";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    base_common::execute(args, SYNTAX, SUMMARY, LONG_HELP, Format::Base64)
+    base_common::execute(args.collect_str(), SYNTAX, SUMMARY, LONG_HELP, Format::Base64)
 }

src/uu/basename/src/basename.rs

@@ -18,7 +18,9 @@ static SUMMARY: &str = "Print NAME with any leading directory components removed
  If specified, also remove a trailing SUFFIX";
 static LONG_HELP: &str = "";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     //
     // Argument parsing
     //

src/uu/cat/src/cat.rs

@@ -124,7 +124,9 @@ enum InputType {
 
 type CatResult<T> = Result<T, CatError>;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optflag("A", "show-all", "equivalent to -vET")
         .optflag(

src/uu/chgrp/src/chgrp.rs

@@ -36,7 +36,9 @@ const FTS_COMFOLLOW: u8 = 1;
 const FTS_PHYSICAL: u8 = 1 << 1;
 const FTS_LOGICAL: u8 = 1 << 2;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = app!(SYNTAX, SUMMARY, "");
     opts.optflag("c",
                  "changes",

src/uu/chmod/src/chmod.rs

@@ -29,7 +29,9 @@ static LONG_HELP: &str = "
  Each MODE is of the form '[ugoa]*([-+=]([rwxXst]*|[ugo]))+|[-+=]?[0-7]+'.
 ";
 
-pub fn uumain(mut args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let mut args = args.collect_str();
+
     let syntax = format!(
         "[OPTION]... MODE[,MODE]... FILE...
  {0} [OPTION]... OCTAL-MODE FILE...

src/uu/chown/src/chown.rs

@@ -36,7 +36,9 @@ const FTS_COMFOLLOW: u8 = 1;
 const FTS_PHYSICAL: u8 = 1 << 1;
 const FTS_LOGICAL: u8 = 1 << 2;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = app!(SYNTAX, SUMMARY, "");
     opts.optflag("c",
                  "changes",

src/uu/chroot/src/chroot.rs

@@ -29,7 +29,9 @@ static LONG_HELP: &str = "
  If $(SHELL) is not set, /bin/sh is used.
 ";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optopt(
             "u",

src/uu/cksum/src/cksum.rs

@@ -71,8 +71,8 @@ fn cksum(fname: &str) -> io::Result<(u32, usize)> {
     //Ok((0 as u32,0 as usize))
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    let matches = app!(SYNTAX, SUMMARY, LONG_HELP).parse(args);
+    let matches = app!(SYNTAX, SUMMARY, LONG_HELP).parse(args.collect_str());
 
     let files = matches.free;
 

src/uu/comm/src/comm.rs

@@ -121,7 +121,9 @@ fn open_file(name: &str) -> io::Result<LineReader> {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optflag("1", "", "suppress column 1 (lines uniq to FILE1)")
         .optflag("2", "", "suppress column 2 (lines uniq to FILE2)")

src/uu/cp/src/cp.rs

@@ -302,7 +302,7 @@ static DEFAULT_ATTRIBUTES: &[Attribute] = &[
     Attribute::Timestamps,
 ];
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = get_usage();
     let matches = App::new(executable!())
         .version(VERSION)
@@ -465,7 +465,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
 
         .arg(Arg::with_name(OPT_PATHS)
              .multiple(true))
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
     if matches.is_present(OPT_VERSION) {
         print_version();

src/uu/cut/src/cut.rs

@@ -423,7 +423,9 @@ fn cut_files(mut filenames: Vec<String>, mode: Mode) -> i32 {
     exit_code
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optopt("b", "bytes", "filter byte columns from the input source", "sequence")
         .optopt("c", "characters", "alias for character mode", "sequence")

src/uu/date/src/date.rs

@@ -129,7 +129,7 @@ impl<'a> From<&'a str> for Rfc3339Format {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let syntax = format!(
         "{0} [OPTION]... [+FORMAT]...
  {0} [OPTION]... [MMDDhhmm[[CC]YY][.ss]]",
@@ -199,7 +199,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
                 .help("print or set Coordinated Universal Time (UTC)"),
         )
         .arg(Arg::with_name(OPT_FORMAT).multiple(true))
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
     let format = if let Some(form) = matches.value_of(OPT_FORMAT) {
         let form = form[1..].into();

src/uu/df/src/df.rs

@@ -741,7 +741,7 @@ fn use_size(free_size: u64, total_size: u64) -> String {
     );
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = get_usage();
     let matches = App::new(executable!())
         .version(VERSION)
@@ -862,7 +862,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
         )
         .arg(Arg::with_name(OPT_PATHS).multiple(true))
         .help("Filesystem(s) to list")
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
     if matches.is_present(OPT_VERSION) {
         println!("{} {}", executable!(), VERSION);

src/uu/dircolors/src/dircolors.rs

@@ -54,7 +54,9 @@ pub fn guess_syntax() -> OutputFmt {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optflag("b", "sh", "output Bourne shell code to set LS_COLORS")
         .optflag(

src/uu/dirname/src/dirname.rs

@@ -19,7 +19,9 @@ static LONG_HELP: &str = "
  directory).
 ";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optflag("z", "zero", "separate output with NUL rather than newline")
         .parse(args);

src/uu/du/src/du.rs

@@ -225,7 +225,9 @@ fn convert_size_other(size: u64, _multiplier: u64, block_size: u64) -> String {
 }
 
 #[allow(clippy::cognitive_complexity)]
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let syntax = format!(
         "[OPTION]... [FILE]...
  {0} [OPTION]... --files0-from=F",

src/uu/echo/src/echo.rs

@@ -102,7 +102,9 @@ fn print_escaped(input: &str, mut output: impl Write) -> io::Result<bool> {
     Ok(should_stop)
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, HELP)
         .optflag("n", "", "do not output the trailing newline")
         .optflag("e", "", "enable interpretation of backslash escapes")

src/uu/env/src/env.rs

@@ -152,7 +152,7 @@ fn create_app() -> App<'static, 'static> {
             .help("remove variable from the environment"))
 }
 
-fn run_env(args: Vec<String>) -> Result<(), i32> {
+fn run_env(args: impl uucore::Args) -> Result<(), i32> {
     let app = create_app();
     let matches = app.get_matches_from(args);
 
@@ -251,7 +251,7 @@ fn run_env(args: Vec<String>) -> Result<(), i32> {
     Ok(())
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     match run_env(args) {
         Ok(()) => 0,
         Err(code) => code,

src/uu/expand/src/expand.rs

@@ -100,7 +100,9 @@ impl Options {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optflag("i", "initial", "do not convert tabs after non blanks")
         .optopt(

src/uu/expr/src/expr.rs

@@ -15,7 +15,9 @@ mod tokens;
 static NAME: &str = "expr";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     // For expr utility we do not want getopts.
     // The following usage should work without escaping hyphens: `expr -15 = 1 +  2 \* \( 3 - -4 \)`
 

src/uu/factor/src/factor.rs

@@ -115,8 +115,8 @@ fn print_factors_str(num_str: &str) {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    let matches = app!(SYNTAX, SUMMARY, LONG_HELP).parse(args);
+    let matches = app!(SYNTAX, SUMMARY, LONG_HELP).parse(args.collect_str());
 
     if matches.free.is_empty() {
         let stdin = stdin();

src/uu/false/src/false.rs

@@ -5,6 +5,6 @@
 //  * For the full copyright and license information, please view the LICENSE
 //  * file that was distributed with this source code.
 
-pub fn uumain(_: Vec<String>) -> i32 {
+pub fn uumain(_: impl uucore::Args) -> i32 {
     1
 }

src/uu/fmt/src/fmt.rs

@@ -57,7 +57,9 @@ pub struct FmtOptions {
 }
 
 #[allow(clippy::cognitive_complexity)]
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optflag("c", "crown-margin", "First and second line of paragraph may have different indentations, in which case the first line's indentation is preserved, and each subsequent line's indentation matches the second line.")
         .optflag("t", "tagged-paragraph", "Like -c, except that the first and second line of a paragraph *must* have different indentation or they are treated as separate paragraphs.")

src/uu/fold/src/fold.rs

@@ -19,7 +19,9 @@ static SUMMARY: &str = "Writes each file (or standard input if no files are give
  to standard output whilst breaking long lines";
 static LONG_HELP: &str = "";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let (args, obs_width) = handle_obsolete(&args[..]);
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optflag(

src/uu/groups/src/groups.rs

@@ -23,7 +23,7 @@ fn get_usage() -> String {
     format!("{0} [USERNAME]", executable!())
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = get_usage();
 
     let matches = App::new(executable!())
@@ -31,7 +31,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
         .about(ABOUT)
         .usage(&usage[..])
         .arg(Arg::with_name(OPT_USER))
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
     match matches.value_of(OPT_USER) {
         None => {

src/uu/hashsum/src/hashsum.rs

@@ -234,7 +234,9 @@ fn detect_algo(
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let program = &args[0];
     let binary_name = Path::new(program).file_name().unwrap().to_str().unwrap();
 

src/uu/head/src/head.rs

@@ -40,7 +40,9 @@ impl Default for Settings {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut settings: Settings = Default::default();
 
     // handle obsolete -number syntax

src/uu/hostid/src/hostid.rs

@@ -23,8 +23,8 @@ extern "C" {
     pub fn gethostid() -> c_long;
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    app!(SYNTAX, SUMMARY, LONG_HELP).parse(args);
+    app!(SYNTAX, SUMMARY, LONG_HELP).parse(args.collect_str());
     hostid();
     0
 }

src/uu/hostname/src/hostname.rs

@@ -35,7 +35,7 @@ static OPT_FQDN: &str = "fqdn";
 static OPT_SHORT: &str = "short";
 static OPT_HOST: &str = "host";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     #![allow(clippy::let_and_return)]
     #[cfg(windows)]
     unsafe {
@@ -57,7 +57,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
 fn get_usage() -> String {
     format!("{0} [OPTION]... [HOSTNAME]", executable!())
 }
-fn execute(args: Vec<String>) -> i32 {
+fn execute(args: impl uucore::Args) -> i32 {
     let usage = get_usage();
     let matches = App::new(executable!())
         .version(VERSION)
@@ -87,7 +87,7 @@ fn execute(args: Vec<String>) -> i32 {
                 possible",
         ))
         .arg(Arg::with_name(OPT_HOST))
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
     match matches.value_of(OPT_HOST) {
         None => display_hostname(&matches),

src/uu/id/src/id.rs

@@ -71,7 +71,9 @@ mod audit {
 static SYNTAX: &str = "[OPTION]... [USER]";
 static SUMMARY: &str = "Print user and group information for the specified USER,\n or (when USER omitted) for the current user.";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = app!(SYNTAX, SUMMARY, "");
     opts.optflag(
         "A",

src/uu/install/src/install.rs

@@ -56,7 +56,9 @@ impl Behavior {
 ///
 /// Returns a program return code.
 ///
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let matches = parse_opts(args);
 
     if let Err(s) = check_unimplemented(&matches) {

src/uu/join/src/join.rs

@@ -444,7 +444,7 @@ impl<'a> State<'a> {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let matches = App::new(NAME)
         .version(VERSION)
         .about(

src/uu/kill/src/kill.rs

@@ -30,7 +30,9 @@ pub enum Mode {
     List,
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let (args, obs_signal) = handle_obsolete(args);
     let matches = app!(SYNTAX, SUMMARY, LONG_HELP)
         .optopt("s", "signal", "specify the <signal> to be sent", "SIGNAL")

src/uu/link/src/link.rs

@@ -23,8 +23,8 @@ pub fn normalize_error_message(e: Error) -> String {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    let matches = app!(SYNTAX, SUMMARY, LONG_HELP).parse(args);
+    let matches = app!(SYNTAX, SUMMARY, LONG_HELP).parse(args.collect_str());
     if matches.free.len() != 2 {
         crash!(1, "{}", msg_wrong_number_of_arguments!(2));
     }

src/uu/ln/src/ln.rs

@@ -56,7 +56,9 @@ pub enum BackupMode {
     ExistingBackup,
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let syntax = format!(
         "[OPTION]... [-T] TARGET LINK_NAME   (1st form)
  {0} [OPTION]... TARGET                  (2nd form)

src/uu/logname/src/logname.rs

@@ -36,8 +36,8 @@ static SYNTAX: &str = "";
 static SUMMARY: &str = "Print user's login name";
 static LONG_HELP: &str = "";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
-    app!(SYNTAX, SUMMARY, LONG_HELP).parse(args);
+    app!(SYNTAX, SUMMARY, LONG_HELP).parse(args.collect_str());
 
     match get_userlogin() {
         Some(userlogin) => println!("{}", userlogin),

src/uu/ls/src/ls.rs

@@ -76,7 +76,9 @@ lazy_static! {
     static ref END_CODE: &'static str = COLOR_MAP.get("ec").unwrap_or(&"");
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let syntax = format!(
         "[OPTION]... DIRECTORY
  {0} [OPTION]... [FILE]...",

src/uu/mkdir/src/mkdir.rs

@@ -19,7 +19,9 @@ static VERSION: &str = env!("CARGO_PKG_VERSION");
 /**
  * Handles option parsing
  */
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     // Linux-specific options, not implemented

src/uu/mkfifo/src/mkfifo.rs

@@ -18,7 +18,9 @@ use std::io::Error;
 static NAME: &str = "mkfifo";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optopt(

src/uu/mknod/src/mknod.rs

@@ -44,7 +44,9 @@ fn _makenod(path: CString, mode: mode_t, dev: dev_t) -> i32 {
 }
 
 #[allow(clippy::cognitive_complexity)]
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     // Linux-specific options, not implemented

src/uu/mktemp/src/mktemp.rs

@@ -29,7 +29,9 @@ static NAME: &str = "mktemp";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 static DEFAULT_TEMPLATE: &str = "tmp.XXXXXXXXXX";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
     opts.optflag("d", "directory", "Make a directory instead of a file");
     opts.optflag(

src/uu/more/src/more.rs

@@ -36,7 +36,9 @@ pub enum Mode {
 static NAME: &str = "more";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     // FixME: fail without panic for now; but `more` should work with no arguments (ie, for piped input)

src/uu/mv/src/mv.rs

@@ -53,7 +53,9 @@ pub enum BackupMode {
     ExistingBackup,
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflagopt(

src/uu/nice/src/nice.rs

@@ -29,7 +29,9 @@ extern "C" {
     fn setpriority(which: c_int, who: c_int, prio: c_int) -> c_int;
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optopt(

src/uu/nl/src/nl.rs

@@ -73,7 +73,9 @@ enum NumberFormat {
     RightZero,
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optopt(

src/uu/nohup/src/nohup.rs

@@ -36,7 +36,9 @@ unsafe fn _vprocmgr_detach_from_console(_: u32) -> *const libc::c_int {
     std::ptr::null()
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("h", "help", "Show help and exit");

src/uu/nproc/src/nproc.rs

@@ -39,7 +39,7 @@ fn get_usage() -> String {
     format!("{0} [OPTIONS]...", executable!())
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = get_usage();
     let matches = App::new(executable!())
         .version(VERSION)
@@ -58,7 +58,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
                 .takes_value(true)
                 .help("ignore up to N cores"),
         )
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
     let mut ignore = match matches.value_of(OPT_IGNORE) {
         Some(numstr) => match numstr.parse() {

src/uu/numfmt/src/numfmt.rs

@@ -280,7 +280,9 @@ fn handle_stdin(options: NumfmtOptions) -> Result<()> {
     Ok(())
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optflag("h", "help", "display this help and exit");

src/uu/od/src/od.rs

@@ -290,7 +290,9 @@ impl OdOptions {
 
 /// parses and validates command line parameters, prepares data structures,
 /// opens the input and calls `odfunc` to process the input.
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let opts = create_getopts_options();
 
     let matches = match opts.parse(&args[1..]) {

src/uu/paste/src/paste.rs

@@ -20,7 +20,9 @@ use std::path::Path;
 static NAME: &str = "paste";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag(

src/uu/pathchk/src/pathchk.rs

@@ -36,7 +36,9 @@ static VERSION: &str = env!("CARGO_PKG_VERSION");
 const POSIX_PATH_MAX: usize = 256;
 const POSIX_NAME_MAX: usize = 14;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     // add options
     let mut opts = Options::new();
     opts.optflag("p", "posix", "check for (most) POSIX systems");

src/uu/pinky/src/pinky.rs

@@ -27,7 +27,9 @@ static SUMMARY: &str = "A lightweight 'finger' program;  print user information.
 
 const BUFSIZE: usize = 1024;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let long_help = &format!(
         "
   -l              produce long format output for the specified USERs

src/uu/printenv/src/printenv.rs

@@ -17,7 +17,9 @@ use std::env;
 static NAME: &str = "printenv";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
     opts.optflag(
         "0",

src/uu/printf/src/printf.rs

@@ -275,7 +275,9 @@ COPYRIGHT :
 
 ";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let location = &args[0];
     if args.len() <= 1 {
         println!(

src/uu/ptx/src/ptx.rs

@@ -491,7 +491,9 @@ fn write_traditional_output(
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
     opts.optflag(
         "A",

src/uu/pwd/src/pwd.rs

@@ -32,7 +32,9 @@ pub fn absolute_path(path: &Path) -> io::Result<PathBuf> {
     Ok(path_buf)
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("", "help", "display this help and exit");

src/uu/readlink/src/readlink.rs

@@ -20,7 +20,9 @@ use uucore::fs::{canonicalize, CanonicalizeMode};
 const NAME: &str = "readlink";
 const VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag(

src/uu/realpath/src/realpath.rs

@@ -19,7 +19,9 @@ use uucore::fs::{canonicalize, CanonicalizeMode};
 static NAME: &str = "realpath";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("h", "help", "Show help and exit");

src/uu/relpath/src/relpath.rs

@@ -19,7 +19,9 @@ use uucore::fs::{canonicalize, CanonicalizeMode};
 static NAME: &str = "relpath";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("h", "help", "Show help and exit");

src/uu/rm/src/rm.rs

@@ -43,7 +43,9 @@ struct Options {
 static NAME: &str = "rm";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     // TODO: make getopts support -R in addition to -r
     let mut opts = getopts::Options::new();
 

src/uu/rmdir/src/rmdir.rs

@@ -16,7 +16,9 @@ use std::path::Path;
 static NAME: &str = "rmdir";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag(

src/uu/seq/src/seq.rs

@@ -170,7 +170,9 @@ fn print_version() {
     println!("{} {}", NAME, VERSION);
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut options = SeqOptions {
         separator: "\n".to_owned(),
         terminator: None,

src/uu/shred/src/shred.rs

@@ -203,7 +203,9 @@ impl<'a> Iterator for BytesGenerator<'a> {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     // TODO: Add force option

src/uu/shuf/src/shuf.rs

@@ -27,7 +27,9 @@ enum Mode {
 static NAME: &str = "shuf";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
     opts.optflag("e", "echo", "treat each ARG as an input line");
     opts.optopt(

src/uu/sleep/src/sleep.rs

@@ -16,10 +16,13 @@ use std::time::Duration;
 static NAME: &str = "sleep";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
     opts.optflag("h", "help", "display this help and exit");
     opts.optflag("V", "version", "output version information and exit");
+
     let matches = match opts.parse(&args[1..]) {
         Ok(m) => m,
         Err(f) => {

src/uu/sort/src/sort.rs

@@ -143,7 +143,9 @@ impl<'a> Iterator for FileMerger<'a> {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut settings: Settings = Default::default();
     let mut opts = getopts::Options::new();
 

src/uu/split/src/split.rs

@@ -20,7 +20,9 @@ use std::path::Path;
 static NAME: &str = "split";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optopt(

src/uu/stat/src/stat.rs

@@ -872,7 +872,9 @@ impl Stater {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optflag("h", "help", "display this help and exit");

src/uu/stdbuf/src/stdbuf.rs

@@ -217,7 +217,9 @@ fn get_preload_env(tmp_dir: &mut TempDir) -> io::Result<(String, PathBuf)> {
     Ok((preload.to_owned(), inject_path))
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optopt(

src/uu/sum/src/sum.rs

@@ -72,7 +72,9 @@ fn open(name: &str) -> Result<Box<dyn Read>> {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("r", "", "use the BSD compatible algorithm (default)");

src/uu/sync/src/sync.rs

@@ -118,7 +118,9 @@ mod platform {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("h", "help", "display this help and exit");

src/uu/tac/src/tac.rs

@@ -18,7 +18,9 @@ use std::io::{stdin, stdout, BufReader, Read, Stdout, Write};
 static NAME: &str = "tac";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag(

src/uu/tail/src/tail.rs

@@ -56,7 +56,9 @@ impl Default for Settings {
 }
 
 #[allow(clippy::cognitive_complexity)]
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut settings: Settings = Default::default();
 
     // handle obsolete -number syntax

src/uu/tee/src/tee.rs

@@ -16,7 +16,9 @@ use std::path::{Path, PathBuf};
 static NAME: &str = "tee";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     match options(&args).and_then(exec) {
         Ok(_) => 0,
         Err(_) => 1,

src/uu/test/src/test.rs

@@ -12,16 +12,12 @@ extern crate libc;
 extern crate syscall;
 
 use std::collections::HashMap;
-use std::env::args_os;
-use std::ffi::OsString;
 use std::str::from_utf8;
 
 static NAME: &str = "test";
 
-// TODO: decide how to handle non-UTF8 input for all the utils
+pub fn uumain(args: impl uucore::Args) -> i32 {
-// Definitely don't use [u8], try keeping it as OsStr or OsString instead
+    let args: Vec<_> = args.collect();
-pub fn uumain(_: Vec<String>) -> i32 {
-    let args = args_os().collect::<Vec<OsString>>();
     // This is completely disregarding valid windows paths that aren't valid unicode
     let args = args
         .iter()

src/uu/timeout/src/timeout.rs

@@ -24,7 +24,9 @@ static VERSION: &str = env!("CARGO_PKG_VERSION");
 
 const ERR_EXIT_STATUS: i32 = 125;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let program = args[0].clone();
 
     let mut opts = getopts::Options::new();

src/uu/touch/src/touch.rs

@@ -41,7 +41,9 @@ macro_rules! local_tm_to_filetime(
     })
 );
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("a", "", "change only the access time");

src/uu/tr/src/tr.rs

@@ -183,7 +183,9 @@ fn usage(opts: &Options) {
     println!("{}", opts.usage("Translate or delete characters."));
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optflag("c", "complement", "use the complement of SET1");

src/uu/true/src/true.rs

@@ -5,6 +5,6 @@
 //  * For the full copyright and license information, please view the LICENSE
 //  * file that was distributed with this source code.
 
-pub fn uumain(_: Vec<String>) -> i32 {
+pub fn uumain(_: impl uucore::Args) -> i32 {
     0
 }

src/uu/truncate/src/truncate.rs

@@ -30,7 +30,9 @@ enum TruncateMode {
 static NAME: &str = "truncate";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("c", "no-create", "do not create files that do not exist");

src/uu/tsort/src/tsort.rs

@@ -19,7 +19,9 @@ use std::path::Path;
 static NAME: &str = "tsort";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("h", "help", "display this help and exit");

src/uu/tty/src/tty.rs

@@ -25,7 +25,9 @@ extern "C" {
 static NAME: &str = "tty";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag("s", "silent", "print nothing, only return an exit status");

src/uu/uname/src/uname.rs

@@ -48,7 +48,7 @@ const HOST_OS: &str = "Fuchsia";
 #[cfg(target_os = "redox")]
 const HOST_OS: &str = "Redox";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = format!("{} [OPTION]...", executable!());
     let matches = App::new(executable!())
         .version(VERSION)
@@ -94,34 +94,43 @@ pub fn uumain(args: Vec<String>) -> i32 {
             .short("o")
             .long(OPT_OS)
             .help("print the operating system name."))
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
-    let argc = args.len();
     let uname = return_if_err!(1, PlatformInfo::new());
     let mut output = String::new();
 
-    if matches.is_present(OPT_KERNELNAME) || matches.is_present(OPT_ALL) || argc == 1 {
+    let all = matches.is_present(OPT_ALL);
+    let kernelname = matches.is_present(OPT_KERNELNAME);
+    let nodename = matches.is_present(OPT_NODENAME);
+    let kernelrelease = matches.is_present(OPT_KERNELRELEASE);
+    let kernelversion = matches.is_present(OPT_KERNELVERSION);
+    let machine = matches.is_present(OPT_MACHINE);
+    let os = matches.is_present(OPT_OS);
+
+    let none = !(all || kernelname || nodename || kernelrelease || kernelversion || machine || os);
+
+    if kernelname || all || none {
         output.push_str(&uname.sysname());
         output.push_str(" ");
     }
 
-    if matches.is_present(OPT_NODENAME) || matches.is_present(OPT_ALL) {
+    if nodename || all {
         output.push_str(&uname.nodename());
         output.push_str(" ");
     }
-    if matches.is_present(OPT_KERNELRELEASE) || matches.is_present(OPT_ALL) {
+    if kernelrelease || all {
         output.push_str(&uname.release());
         output.push_str(" ");
     }
-    if matches.is_present(OPT_KERNELVERSION) || matches.is_present(OPT_ALL) {
+    if kernelversion || all {
         output.push_str(&uname.version());
         output.push_str(" ");
     }
-    if matches.is_present(OPT_MACHINE) || matches.is_present(OPT_ALL) {
+    if machine || all {
         output.push_str(&uname.machine());
         output.push_str(" ");
     }
-    if matches.is_present(OPT_OS) || matches.is_present(OPT_ALL) {
+    if os || all {
         output.push_str(HOST_OS);
         output.push_str(" ");
     }

src/uu/unexpand/src/unexpand.rs

@@ -83,7 +83,9 @@ impl Options {
     }
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = getopts::Options::new();
 
     opts.optflag(

src/uu/uniq/src/uniq.rs

@@ -201,7 +201,9 @@ fn opt_parsed<T: FromStr>(opt_name: &str, matches: &Matches) -> Option<T> {
     })
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optflag("c", "count", "prefix lines by the number of occurrences");

src/uu/unlink/src/unlink.rs

@@ -24,7 +24,9 @@ use std::io::{Error, ErrorKind};
 static NAME: &str = "unlink";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optflag("h", "help", "display this help and exit");

src/uu/uptime/src/uptime.rs

@@ -41,7 +41,7 @@ fn get_usage() -> String {
     format!("{0} [OPTION]...", executable!())
 }
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let usage = get_usage();
     let matches = App::new(executable!())
         .version(VERSION)
@@ -53,7 +53,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
                 .long("since")
                 .help("system up since"),
         )
-        .get_matches_from(&args);
+        .get_matches_from(args);
 
     let (boot_time, user_count) = process_utmpx();
     let uptime = get_uptime(boot_time);

src/uu/users/src/users.rs

@@ -20,7 +20,9 @@ use getopts::Options;
 static NAME: &str = "users";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optflag("h", "help", "display this help and exit");

src/uu/wc/src/wc.rs

@@ -69,7 +69,9 @@ struct Result {
 static NAME: &str = "wc";
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = Options::new();
 
     opts.optflag("c", "bytes", "print the byte counts");

src/uu/who/src/who.rs

@@ -43,7 +43,9 @@ If FILE is not specified, use /var/run/utmp.  /var/log/wtmp as FILE is common.
 If ARG1 ARG2 given, -m presumed: 'am i' or 'mom likes' are usual.
 ";
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
+    let args = args.collect_str();
+
     let mut opts = app!(SYNTAX, SUMMARY, LONG_HELP);
     opts.optflag("a", "all", "same as -b -d --login -p -r -t -T -u");
     opts.optflag("b", "boot", "time of last system boot");

src/uu/whoami/src/whoami.rs

@@ -16,7 +16,7 @@ extern crate uucore;
 
 mod platform;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let app = app_from_crate!();
 
     if let Err(err) = app.get_matches_from_safe(args) {

src/uu/yes/src/yes.rs

@@ -21,7 +21,7 @@ use uucore::zero_copy::ZeroCopyWriter;
 // systems, but honestly this is good enough
 const BUF_SIZE: usize = 16 * 1024;
 
-pub fn uumain(args: Vec<String>) -> i32 {
+pub fn uumain(args: impl uucore::Args) -> i32 {
     let app = app_from_crate!().arg(Arg::with_name("STRING").index(1).multiple(true));
 
     let matches = match app.get_matches_from_safe(args) {