fop(1): finished implementing sysexits

src/fop.rs

@@ -23,7 +23,7 @@ use std::{
 };
 
 extern crate sysexits;
-use sysexits::EX_USAGE;
+use sysexits::{ EX_DATAERR, EX_USAGE };
 
 fn main() {
 	let argv = args().collect::<Vec<String>>();
@@ -67,7 +67,7 @@ fn main() {
 			argv[0],
 			index.to_string()
 		);
-		exit(1);
+		exit(EX_DATAERR);
 	});
 
 	if let Some(mut child_stdin) = spawned.stdin.take() {