Handle SIGPIPE correctly and autogenerate main() for each util

src/uucore/lib.rs

@@ -7,6 +7,8 @@ mod macros;
 #[macro_use]
 pub mod coreopts;
 
+pub mod panic;
+
 #[cfg(feature = "fs")]
 pub mod fs;
 #[cfg(feature = "utf8")]

src/uucore/panic.rs

@@ -0,0 +1,13 @@
+use std::panic;
+
+pub fn install_sigpipe_hook() { 
+    let hook = panic::take_hook();
+    panic::set_hook(Box::new(move |info| {
+        if let Some(res) = info.payload().downcast_ref::<String>() {
+            if res.contains("Broken pipe") {
+                return;
+            }
+        }
+        hook(info)
+    }));
+}