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my $pid = system 1, "bg_script.pl $ARG1 \"$ARG2\" $ARG3 $ARG4 $ARG5";
print "\$pid == '$pid'\n";
...
sleep 10;
$still_running = kill 0, $pid;
print "AFTER SLEEP: \$still_running == '$still_running'\n\n";

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```
$still_running = kill 0, $pid;
```