diff --git a/src/cut/ranges.rs b/src/cut/ranges.rs
index 982cb272b..2a8092fe5 100644
--- a/src/cut/ranges.rs
+++ b/src/cut/ranges.rs
@@ -23,19 +23,19 @@ impl std::str::FromStr for Range {
 
         match (parts.next(), parts.next()) {
             (Some(nm), None) => {
-                from_str::<uint>(nm).and_then(|nm| if nm > 0 { Some(nm) } else { None })
+                std::str::FromStr::from_str::<uint>(nm).and_then(|nm| if nm > 0 { Some(nm) } else { None })
                                     .map(|nm| Range { low: nm, high: nm })
             }
             (Some(n), Some(m)) if m.len() == 0 => {
-                from_str::<uint>(n).and_then(|low| if low > 0 { Some(low) } else { None })
+                std::str::FromStr::from_str::<uint>(n).and_then(|low| if low > 0 { Some(low) } else { None })
                                    .map(|low| Range { low: low, high: MAX })
             }
             (Some(n), Some(m)) if n.len() == 0 => {
-                from_str::<uint>(m).and_then(|high| if high >= 1 { Some(high) } else { None })
+                std::str::FromStr::from_str::<uint>(m).and_then(|high| if high >= 1 { Some(high) } else { None })
                                    .map(|high| Range { low: 1, high: high })
             }
             (Some(n), Some(m)) => {
-                match (from_str::<uint>(n), from_str::<uint>(m)) {
+                match (std::str::FromStr::from_str::<uint>(n), std::str::FromStr::from_str::<uint>(m)) {
                     (Some(low), Some(high)) if low > 0 && low <= high => {
                         Some(Range { low: low, high: high })
                     }
@@ -54,7 +54,7 @@ impl Range {
         let mut ranges = vec!();
 
         for item in list.split(',') {
-            match from_str::<Range>(item) {
+            match std::str::FromStr::from_str(item) {
                 Some(range_item) => ranges.push(range_item),
                 None => return Err(format!("range '{}' was invalid", item))
             }
diff --git a/src/expand/expand.rs b/src/expand/expand.rs
index b0b922d39..6ba026e92 100644
--- a/src/expand/expand.rs
+++ b/src/expand/expand.rs
@@ -13,7 +13,7 @@ extern crate getopts;
 extern crate libc;
 
 use std::io;
-use std::str::from_str;
+use std::str::StrExt;
 
 #[path = "../common/util.rs"]
 #[macro_use]
@@ -28,7 +28,7 @@ fn tabstops_parse(s: String) -> Vec<uint> {
     let words = s.as_slice().split(',').collect::<Vec<&str>>();
 
     let nums = words.into_iter()
-        .map(|sn| from_str::<uint>(sn)
+        .map(|sn| sn.parse::<uint>()
             .unwrap_or_else(
                 || crash!(1, "{}\n", "tab size contains invalid character(s)"))
             )
diff --git a/src/factor/factor.rs b/src/factor/factor.rs
index 5a3c31de0..935c1c645 100644
--- a/src/factor/factor.rs
+++ b/src/factor/factor.rs
@@ -56,7 +56,7 @@ fn print_factors(num: u64) {
 }
 
 fn print_factors_str(num_str: &str) {
-    let num = match from_str(num_str) {
+    let num = match num_str.parse::<u64>() {
         Some(x) => x,
         None => { crash!(1, "{} not a number", num_str); }
     };
diff --git a/src/fmt/fmt.rs b/src/fmt/fmt.rs
index 6168273a0..db5dd748b 100644
--- a/src/fmt/fmt.rs
+++ b/src/fmt/fmt.rs
@@ -140,7 +140,7 @@ pub fn uumain(args: Vec<String>) -> int {
     match matches.opt_str("w") {
         Some(s) => {
             fmt_opts.width =
-                match from_str(s.as_slice()) {
+                match s.parse::<uint>() {
                     Some(t) => t,
                     None => { crash!(1, "Invalid WIDTH specification: `{}'", s); }
                 };
@@ -152,7 +152,7 @@ pub fn uumain(args: Vec<String>) -> int {
     match matches.opt_str("g") {
         Some(s) => {
             fmt_opts.goal =
-                match from_str(s.as_slice()) {
+                match s.parse::<uint>() {
                     Some(t) => t,
                     None => { crash!(1, "Invalid GOAL specification: `{}'", s); }
                 };
@@ -168,7 +168,7 @@ pub fn uumain(args: Vec<String>) -> int {
     match matches.opt_str("T") {
         Some(s) => {
             fmt_opts.tabwidth =
-                match from_str(s.as_slice()) {
+                match s.parse::<uint>() {
                     Some(t) => t,
                     None => { crash!(1, "Invalid TABWIDTH specification: `{}'", s); }
                 };
diff --git a/src/fold/fold.rs b/src/fold/fold.rs
index b66fcb674..721a31203 100644
--- a/src/fold/fold.rs
+++ b/src/fold/fold.rs
@@ -62,7 +62,7 @@ pub fn uumain(args: Vec<String>) -> int {
                 }
             };
         let width = match poss_width {
-            Some(inp_width) => match from_str(inp_width.as_slice()) {
+            Some(inp_width) => match inp_width.parse::<uint>() {
                 Some(width) => width,
                 None => crash!(1, "illegal width value (\"{}\")", inp_width)
             },
diff --git a/src/head/head.rs b/src/head/head.rs
index af0382c2f..5ff853df9 100644
--- a/src/head/head.rs
+++ b/src/head/head.rs
@@ -68,7 +68,7 @@ pub fn uumain(args: Vec<String>) -> int {
                 show_error!("cannot specify both --bytes and --lines.");
                 return 1;
             }
-            match from_str(n.as_slice()) {
+            match n.parse::<uint>() {
                 Some(m) => { line_count = m }
                 None => {
                     show_error!("invalid line count '{}'", n);
@@ -77,7 +77,7 @@ pub fn uumain(args: Vec<String>) -> int {
             }
         }
         None => match given_options.opt_str("c") {
-            Some(count) => match from_str(count.as_slice()) {
+            Some(count) => match count.parse::<uint>() {
                 Some(m) => byte_count = m,
                 None => {
                     show_error!("invalid byte count '{}'", count);
@@ -149,7 +149,7 @@ fn obsolete(options: &[String]) -> (Vec<String>, Option<uint>) {
                 // If this is the last number
                 if pos == len - 1 {
                     options.remove(a);
-                    let number: Option<uint> = from_str(from_utf8(current.slice(1,len)).unwrap());
+                    let number: Option<uint> = from_utf8(current.slice(1,len)).unwrap().parse::<uint>();
                     return (options, Some(number.unwrap()));
                 }
             }
diff --git a/src/nproc/nproc.rs b/src/nproc/nproc.rs
index f90ae46e2..589165288 100644
--- a/src/nproc/nproc.rs
+++ b/src/nproc/nproc.rs
@@ -52,7 +52,7 @@ pub fn uumain(args: Vec<String>) -> int {
     }
 
     let mut ignore = match matches.opt_str("ignore") {
-        Some(numstr) => match from_str(numstr.as_slice()) {
+        Some(numstr) => match numstr.parse() {
             Some(num) => num,
             None => {
                 show_error!("\"{}\" is not a valid number", numstr);
@@ -64,7 +64,7 @@ pub fn uumain(args: Vec<String>) -> int {
 
     if !matches.opt_present("all") {
         ignore += match os::getenv("OMP_NUM_THREADS") {
-            Some(threadstr) => match from_str(threadstr.as_slice()) {
+            Some(threadstr) => match threadstr.parse() {
                 Some(num) => num,
                 None => 0
             },
diff --git a/src/shuf/shuf.rs b/src/shuf/shuf.rs
index 18c9ea066..fc7489413 100644
--- a/src/shuf/shuf.rs
+++ b/src/shuf/shuf.rs
@@ -13,7 +13,6 @@ extern crate getopts;
 extern crate libc;
 
 use std::cmp;
-use std::str::from_str;
 use std::io;
 use std::io::IoResult;
 use std::iter::{range_inclusive, RangeInclusive};
@@ -96,7 +95,7 @@ With no FILE, or when FILE is -, read standard input.",
         let repeat = matches.opt_present("repeat");
         let zero = matches.opt_present("zero-terminated");
         let count = match matches.opt_str("head-count") {
-            Some(cnt) => match from_str::<uint>(cnt.as_slice()) {
+            Some(cnt) => match cnt.parse::<uint>() {
                 Some(val) => val,
                 None => {
                     show_error!("'{}' is not a valid count", cnt);
@@ -191,11 +190,11 @@ fn parse_range(input_range: String) -> Result<RangeInclusive<uint>, (String, int
     if split.len() != 2 {
         Err(("invalid range format".to_string(), 1))
     } else {
-        let begin = match from_str::<uint>(split[0]) {
+        let begin = match split[0].parse::<uint>() {
             Some(m) => m,
             None => return Err((format!("{} is not a valid number", split[0]), 1))
         };
-        let end = match from_str::<uint>(split[1]) {
+        let end = match split[1].parse::<uint>() {
             Some(m) => m,
             None => return Err((format!("{} is not a valid number", split[1]), 1))
         };
diff --git a/src/tail/tail.rs b/src/tail/tail.rs
index b09f98cd5..19b637abe 100644
--- a/src/tail/tail.rs
+++ b/src/tail/tail.rs
@@ -71,7 +71,7 @@ pub fn uumain(args: Vec<String>) -> int {
     if follow {
         match given_options.opt_str("s") {
             Some(n) => {
-                let parsed: Option<u64> = from_str(n.as_slice());
+                let parsed: Option<u64> = n.parse();
                 match parsed {
                     Some(m) => { sleep_msec = m * 1000 }
                     None => {}
@@ -192,7 +192,7 @@ fn parse_size(mut size_slice: &str) -> Option<uint> {
         // sole B is not a valid suffix
         None
     } else {
-        let value = from_str(size_slice);
+        let value = size_slice.parse();
         match value {
             Some(v) => Some(multiplier * v),
             None => None
@@ -222,7 +222,7 @@ fn obsolete(options: &[String]) -> (Vec<String>, Option<uint>) {
                 // If this is the last number
                 if pos == len - 1 {
                     options.remove(a);
-                    let number: Option<uint> = from_str(from_utf8(current.slice(1,len)).unwrap());
+                    let number: Option<uint> = from_utf8(current.slice(1,len)).unwrap().parse();
                     return (options, Some(number.unwrap()));
                 }
             }
diff --git a/src/uniq/uniq.rs b/src/uniq/uniq.rs
index bc4642f4c..626246bef 100644
--- a/src/uniq/uniq.rs
+++ b/src/uniq/uniq.rs
@@ -111,7 +111,7 @@ impl Uniq {
 
 fn opt_parsed<T: FromStr>(opt_name: &str, matches: &getopts::Matches) -> Option<T> {
     matches.opt_str(opt_name).map(|arg_str| {
-        let opt_val: Option<T> = from_str(arg_str.as_slice());
+        let opt_val: Option<T> = arg_str.parse();
         opt_val.unwrap_or_else(||
             crash!(1, "Invalid argument for {}: {}", opt_name, arg_str))
     })