STDOUT STDERR and response code from external Linix command

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|");
[download]

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

Comment on STDOUT STDERR and response code from external Linix command Download Code

Replies are listed 'Best First'.
Re: STDOUT STDERR and response code from external Linix command by zentara (Cardinal) on Jan 05, 2012 at 12:49 UTC
Try IPC::System::Simple, it has a reliable way of getting return codes. I'm not really a human, but I play one on earth. Old Perl Programmer Haiku ................... flash japh	[reply]
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 [download] mr.nick ...	[reply] [d/l]
Re^2: STDOUT STDERR and response code from external Linix command by Eliya (Vicar) on Jan 04, 2012 at 21:49 UTC
my $ret=`sh -e '$cmd' 2>&1`; [download] 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 [download]	[reply] [d/l] [select]
Re^3: STDOUT STDERR and response code from external Linix command by gdanenb (Acolyte) on Jan 05, 2012 at 06:41 UTC
Could you pls explain why I need open one more shell? Do I need to do the same when calling external scripts(perl,python) ?	[reply]
Re^4: STDOUT STDERR and response code from external Linix command by Eliya (Vicar) on Jan 05, 2012 at 11:01 UTC