diff --git a/src/fop.rs b/src/fop.rs
index 4f80bd6..04eec7e 100644
--- a/src/fop.rs
+++ b/src/fop.rs
@@ -26,7 +26,7 @@ extern crate sysexits;
 extern crate getopt;
 
 use getopt::{ Opt, Parser };
-use sysexits::{ EX_DATAERR, EX_USAGE };
+use sysexits::{ EX_DATAERR, EX_IOERR, EX_UNAVAILABLE, EX_USAGE };
 
 fn main() {
 	let argv = args().collect::<Vec<String>>();
@@ -60,17 +60,24 @@ fn main() {
 	});
 
 	let mut buf = String::new();
-	stdin().read_to_string(&mut buf).unwrap();
+	let _ = stdin().read_to_string(&mut buf);
 	let mut fields = buf.split(d).collect::<Vec<&str>>();
 
-	let opts = argv.iter().clone().skip(command_arg + 1).collect::<Vec<&String>>();
+	let opts = argv
+		.iter()
+		.clone()
+		.skip(command_arg + 1)
+		.collect::<Vec<&String>>();
 
 	let mut spawned = Command::new(argv.get(command_arg).unwrap())
 		.args(opts)
 		.stdin(Stdio::piped())
 		.stdout(Stdio::piped())
 		.spawn()
-		.unwrap();
+		.unwrap_or_else( |_| {
+			eprintln!("{}: {}: Command not found.", argv[0], argv[command_arg]);
+			exit(EX_UNAVAILABLE);
+		});
 
 	let field = fields.get(index).unwrap_or_else(|| {
 		eprintln!(
@@ -82,15 +89,28 @@ fn main() {
 	});
 
 	if let Some(mut child_stdin) = spawned.stdin.take() {
-		child_stdin.write_all(field.as_bytes()).unwrap();
+		let _ = child_stdin.write_all(field.as_bytes());
 		drop(child_stdin);
 	}
 
-	let output = spawned.wait_with_output().unwrap();
+	let output = spawned.wait_with_output().unwrap_or_else(|| {
+		eprintln!("{}: {}: Command has no output.",
+			argv[0],
+			argv[command_arg]
+		);
+		exit(EX_IOERR);
+	});
 
-	let new_field = String::from_utf8(output.stdout).unwrap();
+	let new_field = String::from_utf8(output.stdout).unwrap_or_else(|_| {
+		eprintln!(
+			"{}: {}: Command output is invalid UTF-8.",
+			argv[0],
+			argv[command_arg]
+		);
+		exit(EX_IOERR);
+	});
 
-	fields[index] = &new_field;
+	fields[index] = &new_field.trim_end();
 
 	print!("{}", fields.join(&d.to_string()));
 }