从bash脚本运行的perl脚本的状态

Question

As far as I know we can use $? to get the result of a command we executed and it will return a non-zero result on error and a 0 result on success provided that the programmer kept the convention.
But what about when we run perl scripts?
I am new in perl but I think that perl scripts return 1 if they are part of a module otherwise they don't return anything.
So how can I know what happened to a perl script I run?

Answer 1

Perl scripts behave the same when run from the shell. Having test.pl :

#!/usr/bin/env perl
exit(0); # or just exit

running:

./test.pl && echo "OK" || echo $?
OK

Having

#!/usr/bin/env perl
exit(123);

running:

./test.pl && echo "OK" || echo $?
123

Having

#!/usr/bin/env perl
die;

running:

./test.pl && echo "OK" || echo $?
Died at ./test.pl line 2.
255

So:

• Exiting from perl script with 0 (or nothing) will be true in shell.
• Exiting from perl script with a (byte) value other than 0 will be false in shell and $? will give you the exit value.
• Exiting from perl script with die will be false in shell and $? will be 255 (in my case - I checked it).