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Top Forums Shell Programming and Scripting Want to terminate command execution when string found in the command output Post 302715317 by RudiC on Sunday 14th of October 2012 01:28:44 PM
Old 10-14-2012
As elixir_sinari and alister pointed out, there are some improvements possible to your command line to get where you want.
  1. Two of the three lines you show in post #1 are error msgs output to stderr. No piped filter will see those unless you redirect stderr.
  2. The grep cmd is pointless. awk can do this.
  3. If you want do stop after the first matched output, you could close the pipe.
Given your post #1 sample, my comments to elixir_sinari's suggestion combined with alister's might do the job:
Code:
snmpwalk -v 3  -u WANDL_SU -a MD5 -A vfipmpls -x DES -X VfIpMpLs -l authPriv 182.19.96.13 2>/dev/null|awk -F"[: ]" '/ae0\.784/{print $3; exit}' > outputfile

It will suppress error msgs, print the ifDescr.2500 to the outputfile as desired, and then exit and close the pipe, (hopefully) causing the snmpwalk cmd to terminate. Pls check out and come back with results.

Last edited by RudiC; 10-14-2012 at 02:35 PM..
 

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COMMAND-NOT-FOUND(1)					    http://en.opensuse.org/Sco					      COMMAND-NOT-FOUND(1)

NAME
command-not-found - A command-not-found handler SYNOPSIS
command-not-found {binary_name} {repository} ARGUMENTS
The following arguments are required: binary_name The name of binary you are looking for. repository The name of repository for search. For most cases, use zypp DESCRIPTION
command-not-found handler is designed to tell users which package contains a missing command. The handler is integrated to bash(1) and zsh(1) shells and is not necessary to call it directly. Just type a name of the command in your favourite shell and you'll get a result. If you consider c-n-f handler useless, just add unset command_not_found_handle to your profile or remove the command-not-found package. Handler doesn't call the command-not-found binary directly, it only prints info about it. If you want to invoke it automatically, just add export COMMAND_NOT_FOUND_AUTO=1 to your bash profile. EXAMPLE
: NORMAL USAGE For example you want to try blender, because you have heard that is an amazing program. So just type blender in shell: $ blender You get the following output: The program 'blender' can be found in the following package: * blender [ path: /usr/bin/blender, repository: zypp (openSUSE 11.1-0) ] Try installing with: sudo zypper install blender bash: blender: command not found SEE ALSO
scout(1) AUTHOR
Pavol Rusnak <stick@gk2.sk> Developer http://gitorious.org/opensus 08/07/2009 COMMAND-NOT-FOUND(1)
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