perldoc -f open and go down a long way to where it talks about doing things like 
open(FOO, '-|') || exec 'cat', '-n', $file;

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The calling script reads the STDOUT of the exec'd program via the FOO filehandle. You'd need to redirect STDERR to STDOUT if you want them both to go there.
Caution: Contents may have been coded under pressure.

In reply to Re: Exec'ing and output by Roy Johnson
in thread Exec'ing and output by Anonymous Monk

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