if (subroutine()) { # if the return value of subroutine is "true" (see reference above)
   exit 0; # success
} else {
   exit 1; # failure
}

##</code><code>##

exit subroutine();

##</code><code>##

perl -e 'print "How sweet does a rose smell? "; chomp ($n = <STDIN>); $rose = "smells sweet to degree $n"; *other_name = *rose; print "$other_name\n"'