At work I learned about a tool called perror, that showed the literal string corresponding to a numeric UNIX error. So if you get a message from a program that says "errno 13", you can run perror to easily translate that into "Permission denied". When I went to install it at home, I found out that it's in Debian package mysql-server (!). So I made my own version:

foreach (grep /^\d+$/, @ARGV) {
  $! = $_;
  print "$_: $!";
}

[download]

Which can be turned into a oneliner:

$ perl -le'print "$_: ", $! = $_ foreach grep /^\d+$/, @ARGV' 13 20   
+## It even respects your locale settings
13: Permiso denegado
20: No es un directorio

[download]

--
David Serrano

In reply to perror.pl by Hue-Bond

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