<oerjan> learn print_args_or_input Is a utility command that makes it easy to create a shell script that can be used either as a pipe or directly as a HackEgo command. Use as print_args_or_input "$@" | yourShellCode . See also shebang_args_or_input.

#!/bin/sh
exec perl -e'open$I,"<","share/mtg/allsets.txt"or die$!;$/=""; @c=grep{/(?mi:$ARGV[0])/}<$I>; print($c[rand(@c)] || "No card found.");' -- "$1"