Get an answer from a `command` .

[shlomyb]

I use `a.pl` command inside my script.
I want to get the answer from `a.pl` (success/fail).
1.can I use ?

`a.pl`;
$answer=$?;

2.I try it and when a.pl returns 1 $answer was 256 ?!
Can someone explain it to me ?

 

[stevexff]

If you execute a command in backticks or qx{}, perl returns the resulting STDOUT as a list, e.g.

my @files = qx{ls -al};

If you invoke a command using the system call, you get the return code, not the output.

Does this help at all?

Steve

[small]"Every program can be reduced by one instruction, and every program has at least one bug. Therefore, any program can be reduced to one instruction which doesn't work." (Object:erlDesignPatterns)[/small]

 

[PaulTEG]

$files=qx{ls -al}; should also work, the array is a nice feature though

Paul
------------------------------------
Spend an hour a week on CPAN, helps cure all known programming ailments ;-)

 

[shlomyb]

Thanks.

 

[MillerH]

Also, because it's a perl script, you could also do, require, or eval the file:

http://perldoc.perl.org/functions/do.html

http://perldoc.perl.org/functions/require.html

http://perldoc.perl.org/functions/eval.html

I'm not advocating any method right now. This is just a note.