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Interpret $? variable

by rbala (Acolyte)
on Sep 12, 2013 at 09:40 UTC ( [id://1053686]=perlquestion: print w/replies, xml ) Need Help??

rbala has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks, When a process is successful I see the value stored in this variable is 0. But , if unsucessful, the value is undeterministic and for various commands, I get different outputs. But I just need to check if the command is successful or not. My doubt is, can i confirm that if $? is 0 , then the command is successful ? Thanks, Bala.

Replies are listed 'Best First'.
Re: Interpret $? variable
by mtmcc (Hermit) on Sep 12, 2013 at 09:51 UTC
    It depends on the command.

    Have a look at this. I hope it's helpful.

[reply]
      Thank you
[reply]
Re: Interpret $? variable
by daxim (Curate) on Sep 12, 2013 at 09:50 UTC
    Yes, that's the convention. I recommend IPC::System::Simple which has a very convenient API for this use-case. 

    use IPC::System::Simple qw(runx);
runx [0], 'some_command', @more_arguments;

    [download]
[reply]
[d/l]
Re: Interpret $? variable
by Marshall (Canon) on Sep 13, 2013 at 06:36 UTC
    Yes,
    The return value of "zero" usually means success.

    Something other than "0" usually means "Oops -
    problem with an error code".

    The error code is deterministic, but depends upon
    the error codes for that subroutine.

[reply]

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