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Backticks and exit status

by space_monk (Chaplain)
on Oct 31, 2012 at 14:25 UTC ( #1001671=note: print w/ replies, xml ) Need Help??


in reply to Re: Run multiple shell commands on the same perl script
in thread Run multiple shell commands on the same perl script

$? returns the result code from the last system() call or backtick operation, I believe, so you can both capture output and process result codes.

Example:

#!/bin/perl # first command deliberately generates an error.... print `rubbish`; print "Rubbish Result: $?\n"; # this command should succeed print "ls Output:\n"; print `ls -l`; print "ls Result: $?\n";
Output:
Rubbish Result: -1 ls Output: total 10 -rw-r--r-- 1 Userid Domain Users 1242 Oct 30 10:04 1.txt -rw-r--r-- 1 Userid Domain Users 1531 Oct 30 10:04 2.txt -rwxr-xr-x 1 Userid Domain Users 351 Oct 30 10:48 test.pl -rwxr-xr-x 1 Userid Domain Users 108 Oct 31 14:21 var.pl ls Result: 0
Note the first output of $? is -1 (an error), whilst the second is 0 (success)


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