The other solutions listed here are better, but if you really want to do it in your perl script:
First way: ./script | ./monitor.pl
# monitor.pl
while(<>) {
if(/wantthis/) { dosomething($_); }
if(/warning/) {dosomethingelse($_); }
print; ## pass on the output
}
Option 2 - run the program from perl
# monitor.pl
open(INPUT, "./script |") or die $!;
while(<INPUT>) {
# same as above
if(/regex/) { dosomething($_); }
print;
}
close INPUT;
Yet another way: If the script itself is perl, have it monitor it's own output.
# adapted from Perl Cookbook
sub filteroutput {
return if my $pid = open(STDOUT, "|-");
die "cannot fork: $!" unless defined $pid;
while(<STDIN>) {
if(/regex/) { dosomething($_); }
print;
}
exit; #exit forked monitoring process
}
Now add filteroutput(); above the rest of the script's normal code. It's self-monitoring.
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