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STDOUT STDERR and response code from external Linix command

by gdanenb (Acolyte)
on Jan 04, 2012 at 20:02 UTC ( #946281=perlquestion: print w/ replies, xml ) Need Help??
gdanenb has asked for the wisdom of the Perl Monks concerning the following question:

I want to get both stdout and stderr into $var, and get correct $?
I went through solutions in perlfac8 and forums
The strange thing that I DON'T get sdterr in any case, as long as correct result code.
perl version is 5.8.8, Linux RH 5

my $cmd="lsss"; my $out=`$cmd 2>&1`; or my $out=qx($cmd 2>&1); or open(PIPE, "$cmd 2>&1|");

stdout when command is correct I get ok. I don't want to use additional *capture* modules.

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Re: STDOUT STDERR and response code from external Linix command
by mr.nick (Chaplain) on Jan 04, 2012 at 21:21 UTC
    Something like this?
    [a209624@cdrzw2051 ~]$ cat foo.pl my $cmd="lessss"; my $ret=`sh -e '$cmd' 2>&1`; print "$cmd = $ret = $?\n"; [a209624@cdrzw2051 ~]$ perl foo.pl lessss = sh: lessss: No such file or directory = 256

    mr.nick ...

      my $ret=`sh -e '$cmd' 2>&1`;

      Didn't you mean -c ?

      for my $cmd ('date', 'dat', 'date -foo') { print "cmd: $cmd\n"; my $out = `sh -c '$cmd' 2>&1`; my $rc = $? >> 8; print "out: $out"; print "rc: $rc\n\n"; } __END__ cmd: date out: Wed Jan 4 22:40:20 CET 2012 rc: 0 cmd: dat out: sh: dat: not found rc: 127 cmd: date -foo out: date: `oo': No such file or directory rc: 1

        Could you pls explain why I need open one more shell?

        Do I need to do the same when calling external scripts(perl,python) ?

Re: STDOUT STDERR and response code from external Linix command
by zentara (Archbishop) on Jan 05, 2012 at 12:49 UTC

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