I wrote a tutorial on Parsing your script's command line, which may be of some assistance.

I'm wondering if this might be confusion about terminology. If you run that other program and it prints all this information on your screen, this is called the "standard out" (or "stdout") of that program. If you want your own perl script to read this in directly from that program (not from a disk file), then you simply place your perl script as part of a "pipeline" command, using the "vertical bar" character to join the output of that other command as the input to your perl script -- like this:

other_program arg1 arg2 | your_perl_script
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This way your perl script simply needs to read STDIN, using the common idiom:

while (<>)
{
  # handle each line of data here
}
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