I'd be more inclined to use -l in a command line so that chomps are done automatically when used with -n or -p, but a pure perl one liner could be ...

perl -nle 'print if -e "/home/$_/bin/filename"' file

... if you needed to use a seperate file, but on UNIXish systems (possibly others?) you can use getpwent() to get usernames and home directories (esp. since they may not always be under /home/!) of active accounts instead of using a seperate file.

perl -le 'while (($u,$d)=(getpwent)[0,7]) { print $u if -e "$d/bin/$ARGV[0]" }' filename

    --k.

In reply to Re: Re: Command line question by Kanji
in thread Command line question by monk2b

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