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  1. or download this
    $cmd="$scriptsdir/process_tar.pl $file >> /tmp/testlog &";            
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$pid=open(PID,"|$cmd");
  2. or download this
    #!/usr/bin/perl
# file pid.pl
sleep 1; print "$0 PID: $$\n";
  3. or download this
    #!/usr/bin/perl

...
my PID is 4465
PID returned by open: 4465
./pid.pl PID : 4466