<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
perl -n -e '/:(.*?)!.*JOIN/; $j{$1}++; END {print "$_ $j{$_};" for sort {$j{$b} <=> $j{$a}} keys %j}' $@