Why no use qx ? 
$sysret = qx(prog1 file1 | filter -v $version > $tmpfile 2>&1);

[download]
Though I haven't tested the code I use this way of
executing shell-commands in some of my own code so it
should work... (I hope ;-) )

/k2

In reply to Re: SIGINT in system() with shell metachars by k2
in thread SIGINT in system() with shell metachars by cadphile

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