scripting help

[Steven W. Orr]

On Friday, Sep 29th 2006 at 19:56 +0100, quoth Tom Brown:

=>
=>> You set the variable EXITCODE to the standard output of the SNMPWALK
=>> command. I have no idea what you want to do with the output but to check the
=>> exit status you want something like this:
=>> 
=>> $SNMPWALK -v 1 -c $COMMUNITY $HOST $STATUS
=>> EXITCODE=$?
=>> 
=>> Also, do not use backquotes when you can use $( cmd ) instead.
=>> 
=>> output=$($SNMPWALK -v 1 -c $COMMUNITY $HOST $STATUS)
=>
=>i am trying to get a plugin to work that uses snmp to execute checks on remote
=>hosts over snmp and return that value to nagios. I was using this as an
=>assistance
=>
=>http://www.kilala.nl/Sysadmin/retrieve_custom_snmp.php
=>
=>i am no developer thats for sure but i will try to muddle through.
=>
=>any more help appreciated
=>
=>thanks

This might help. Any program that you run can produce output. Any program 
that cleanly exits will produce an exit code. You can save the output of a 
program through tricks like this

prog > file

The exit code is referenced from shell scripts via the variable $?. It 
always contains the value of the exit code of the last command. So if you 
need to examine the exit status of something from a few commands ago, 
then you need to save it in a variable.

prog
EXITCODE=$?
blah
blah
if (( EXITCODE != 0 ))
then 
	# Now we're in trouble...

The use of backquotes causes a command to return the output of the 
program. 

foo=`prog` 

will be equal to the text of whatever was writen during the run of prog.

Make sense?

-- 
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steveo at syslang.net