if ($time_val = "01:01:00") {
I'm not really sure I understand what exactly you need to do... (something like cron?) but replacing the assignment with a comparison will likely get you closer to success:
if ($time_val eq "01:01:00") {
Similarly, putting the ... = localtime time in the loop, so the values to check against will actually change.
Also, you probably meant system "./abc.sh PB"; to run the shell script.
Other than that, maybe add a sleep in the loop, so you don't consume unnecessarily large amounts of CPU power...
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