sysadmin crate?

sample.rs

extern crate sysadmin;

use sysadmin::{file};

// Use docopt.rs to generate the cli arguments, process ARGV,
// and set up a main() that runs the run function. Checks the
// results and runs at_exit with nice error messages and a variety
// of error codes
cli!(
    "Usage: wc [--lines] <file>
      -l, --lines       Show the count of lines
    "
);

fn run(args: Args) -> Result<SysadminError> {
    let Args{cmd_file: filename, flag_lines: lines} = args;
    // Raise good looking errors for IO, file not found, etc
    // We would only have to make these once
    let file = try!(file::open(&filename));
    if flag_lines {
        lines = try!(file.split(b'\n'));
        prinln!("lines: {}", lines.count());
    } else {
        spaces = try!(file.split(b' '));
        println!("words: {}", spaces.count());
    }
}