$ pm_child_execs.pl
in test2
Can't exec "1": No such file or directory at ./pm_child_execs.pl line 13.
in test1
Can't exec "1": No such file or directory at ./pm_child_execs.pl line 13.
in test2
Can't exec "1": No such file or directory at ./pm_child_execs.pl line 13.

##</code><code>##

       exec $cmd->();

##</code><code>##

       #exec $cmd->();
       $cmd->();
       last;

##</code><code>##

$ pm_child_execs.pl
in test2
in test1