Crate shells

Wrapper around std::process::Command which make the use of Rust for shell scripting more appealing.

Simple example

let (code, stdout, stderr) = sh!("echo '{} + {}' | bc", 1, 3);

assert_eq!(code, 0);
assert_eq!(&stdout[..], "4");
assert_eq!(&stderr[..], "");

A mnemotechnic to remember the ordering of the elements in the resulting tuple is the positions of stdout and stderr, they correspond to the standard streams numbers: 1 and 2 respectively.

If I a missing your favorite (at least partially) POSIX-compliant shell, submit a pull request!

Macros

ash!	Macro to execute the given command using the Almquist Shell.
bash!	Macro to execute the given command using the Bourne Again Shell.
csh!	Macro to execute the given command using the C Shell.
dash!	Macro to execute the given command using the Debian Almquist Shell.
fish!	Macro to execute the given command using the Fish Shell.
ksh!	Macro to execute the given command using the Korn Shell.
mksh!	Macro to execute the given command using the MirBSD Korn Shell.
sh!	Macro to execute the given command using the Posix Shell.
tcsh!	Macro to execute the given command using the TENEX C Shell.
zsh!	Macro to execute the given command using the Z Shell.