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Full Discussion: Want to terminate command execution when string found in the command output
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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LEARN ABOUT REDHAT

snmpwalk

SNMPWALK(1)							     Net-SNMP							       SNMPWALK(1)

NAME

       snmpwalk - communicates with a network entity using SNMP GETNEXT requests.

SYNOPSIS

       snmpwalk [APPLICATION OPTIONS] [COMMON OPTIONS] [OID]

DESCRIPTION

       snmpwalk is an SNMP application that uses SNMP GETNEXT requests to query a network entity for a tree of information.

       An  object  identifier  (OID)  may  be  given on the command line.  This OID specifies which portion of the object identifier space will be
       searched using GETNEXT requests.  All variables in the subtree below the given OID are queried and their  values  presented  to	the  user.
       Each variable name is given in the format specified in variables(5).

       If  no  OID  argument  is  present, snmpwalk will search MIB-2.	If the network entity has an error processing the request packet, an error
       packet will be returned and a message will be shown, helping to pinpoint why the request was malformed.

       If the tree search causes attempts to search beyond the end of the MIB, the message "End of MIB" will be displayed.

OPTIONS

       -Cc     Do not check whether the returned OIDs are increasing.  Some agents (LaserJets are an example) return OIDs out of  order,  but  can
	       complete the walk anyway.  Other agents return OIDs that are out of order and can cause snmpwalk to loop indefinitely.  By default,
	       snmpwalk tries to detect this behavior and warns you when it hits an agent acting illegally.  Use -Cc to turn off this behaviour.

       -Ci     Include the given OID in the search range.  Normally snmpwalk uses GETNEXT requests starting with the OID you specified and returns
	       all  results  in  the  MIB  tree  after	that OID.  Sometimes, you may wish to include the OID specified on the command line in the
	       printed results if it is a valid OID in the tree itself.  This option lets you do this.

       -Cp     Upon completion of the walk, print the number of variables found.

       In addition to these options, snmpwalk takes the common options described in the snmpcmd(1) manual page.

EXAMPLE

       The command:

       snmpwalk -Os -c public -v 1 zeus system

       will retrieve all of the variables under system:

       sysDescr.0 = STRING: "SunOS zeus.net.cmu.edu 4.1.3_U1 1 sun4m"
       sysObjectID.0 = OID: enterprises.hp.nm.hpsystem.10.1.1
       sysUpTime.0 = Timeticks: (155274552) 17 days, 23:19:05
       sysContact.0 = STRING: ""
       sysName.0 = STRING: "zeus.net.cmu.edu"
       sysLocation.0 = STRING: ""
       sysServices.0 = INTEGER: 72

SEE ALSO

       snmpcmd(1), snmpbulkwalk(1), variables(5).

4th Berkeley Distribution					    08 Feb 2002 						       SNMPWALK(1)
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