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Old 11-01-2012, 04:19 AM   #1
Registered: Jan 2008
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Perl: suppress std output and std error


I am executing below perl command.

# perl -le '@tlinfo = `cat /tmp/hoststemp1`; foreach $j (@tlinfo) { chomp($j); $fqdn = qx(host $ > /dev/null && echo  $;$pingstatus = qx(ping -c 1 $fqdn > /dev/null 2>&1 && echo OK || echo Down);chomp($pingstatus);chomp($fqdn);print "$pingstatus";}' is alive
OK is alive

I do not want " is alive" this line to be printed. I am only interested in OK or Down output. even if I redirect output and error to /dev/null, this line is getting printed on std output.

Can anyone please help me
Old 11-01-2012, 06:22 AM   #2
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I don't know if I can help here. In perldoc for the qx command (which is very verbose) there is somthing explained about STDOUT and STDERR. It's available on the commandline with
perldoc -f qx


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