As long as you're looking at perl code anyway, backticks should be somewhat familiar... 

$ prog.pl `ls file*`

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Of course, this is kinda silly - since you can just run "prog.pl file*" to get the same output. But you may want to do something fancy: 
$ prog.pl `grep KEYWORD file* | cut -f1 -d:`

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Mind you, you can't embed backquotes in backquotes. Thankfully, you said "Linux" where I read "bash" over "sh" anyway. So we switch to something like this: 
$ prog.pl $(grep $(getkeyword.pl foo) file* | cut -f1 -d:)

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Remember: Unix isn't just a shell for running perl. :-)

In reply to Re: Receiving Standard Input/Piped by Tanktalus
in thread Receiving Standard Input/Piped by thekestrel

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