$ ./forker.pl true ; echo "EXIT $?"
Executing true
[child] Exiting with exit code 0.
[parent] Exiting with exit code 0.
EXIT 0

$ ./forker.pl false ; echo "EXIT $?"
Executing false
[child] Exiting with exit code 1.
[parent] Exiting with exit code 1.
EXIT 1

$ ./forker.pl sleep 10 ; echo "EXIT $?"
Executing sleep 10
[parent] Child is still running.
[parent] Exiting with exit code 0.
EXIT 0
<10 seconds later> [child] Exiting with exit code 0.

$ ./forker.pl bogus ; echo "EXIT $?"
Executing bogus
Can't exec "bogus": No such file or directory at ./forker.pl line 22.
[child] Exiting with exit code 127.
[parent] Exiting with exit code 127.
EXIT 127

$ ./bogus ; echo "EXIT $?"
bash: ./bogus: No such file or directory
EXIT 127