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Want to terminate command execution when string found in the command output

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Top Forums Shell Programming and Scripting Want to terminate command execution when string found in the command output
# 8  
Old 10-18-2012
Hi All,

the command RudC is working fine alone..but I need this to check for multiple addresses and here my script to get ifdescr for multiple addresses, it is not giving me proper output(no output) can anyonce suggest what is wrong here..
Code:
#!/bin/bash
{
if [ -f ifdesc.out ];
then
`rm ifdesc.out`
fi
exec<ifdesc.csv
while IFS=',' read -r f1 f2
do
snmpwalk -v 3  -u snmp_com -a MD5 -A vfies -x DES -X VfIeis -l authPriv $f1 2>/dev/null|awk -F"[: ]" '/$f2/{print $3; exit}' > ifdesc.out
done
} > /dev/null 2>&1

where $f1=ipaddres and $f2 is the interface name.

Please help out with this..

Thanks,
Hanumant
Last edited by Franklin52; 10-18-2012 at 08:19 AM.. Reason: Please use code tags for data and code samples
# 9  
Old 10-18-2012
pls. use code tags!
You can't have shell variables expanded within single quotes. The correct way to get f1 into the awk command is to add an awk variable assignment before or after the awk expression and use this inside the command:
Code:
awk -F"[: ]" '/F2awk/{print $3; exit}' F2awk=$f2

# 10  
Old 10-18-2012
Quote:
Originally Posted by RudiC
pls. use code tags!
You can't have shell variables expanded within single quotes. The correct way to get f1 into the awk command is to add an awk variable assignment before or after the awk expression and use this inside the command:
Code:
awk -F"[: ]" '/F2awk/{print $3; exit}' F2awk=$f2

That's incorrect usage of an awk variable in a regexp match. That'll be treated as a match for the pattern "F2awk" and not that for the value contained in the variable by the same name. And, use double quotes to prevent the shell from messing with the data with whitespaces.

The correct usage is:
Code:
awk -F"[: ]" '$0 ~ F2awk{print $3; exit}' F2awk="$f2"

Last edited by elixir_sinari; 10-18-2012 at 08:02 AM..
# 11  
Old 10-18-2012
Hi,

thanks to both of you for reply..

here is the updated script...still not working..when i run it it keeps on running but don't stop..and also no output in output file,
Code:
#!/bin/bash
{
if [ -f ifdesc.out ];
then
`rm ifdesc.out`
fi
exec<ifdesc.csv
while IFS=',' read -r f1 f2
do
snmpwalk -v 3  -u WANDL_SU -a MD5 -A vfipmpls -x DES -X VfIpMpLs -l authPriv $f1 2>/dev/null|awk -F"[: ]" '$0 ~ F2awk{print $3; exit}' F2awk="$f2" > ifdesc.out
done
}


we are near to close this ..plz help..

---------- Post updated at 07:15 AM ---------- Previous update was at 07:09 AM ----------

hey ...here I got the output in my output file..but i feed 5 IP and I got output of only one IP i.e. last IP in the list..plz help me...it should print new output for new ip address on new line..and this will be done...

thanks ...
Last edited by Franklin52; 10-18-2012 at 10:31 AM.. Reason: Please use code tags for data and code samples
# 12  
Old 10-18-2012
Use >> .
> deletes old data and writes new data to the file..Smilie

Code:
snmpwalk -v 3  -u WANDL_SU -a MD5 -A vfipmpls -x DES -X VfIpMpLs -l  authPriv $f1 2>/dev/null|awk -F"[: ]" '$0 ~ F2awk{print $3; exit}'  F2awk="$f2" >> ifdesc.out

# 13  
Old 10-18-2012
Quote:
Originally Posted by elixir_sinari
That's incorrect usage of an awk variable in a regexp match. ...
You're right. I did it on the fly and had no chance to test. Sorry for the premature post.
# 14  
Old 10-19-2012
Hiii...yupeeii...I am getting the required output in my output file now....thaks to all those who helped me to acheive this..but still need to make it more finetune..

here my script...

Code:
#!/bin/bash
{
if [ -f ifdesc.out ];
then
`rm ifdesc.out`
fi
exec<ifdesc.csv
while IFS=',' read -r f1 f2
do
snmpwalk -v 3  -u WANDL_SU -a MD5 -A vfipmpls -x DES -X VfIpMpLs -l authPriv $f1 2>/dev/null|awk -F"[: ]" '$0 ~ F2awk{print $3; exit}' F2awk="$f2" >> ifdesc.out
done
}

In this script..it may be possible that few devices may never give out any result i.e. snmpwalk output in this case it will directly print the next result in series..what I need is put the IP Address in one column and its respective result (interface ifindex) in next column so that it will be very easy to identify which IP have not responded to SNMP query.

Thanks again to ALL experts!!!

---------- Post updated 10-19-12 at 12:45 AM ---------- Previous update was 10-18-12 at 08:41 AM ----------

Hi All,

please reply to my bove query.

regards,
hanumant
Last edited by Scott; 10-18-2012 at 10:45 AM.. Reason: Code tags, PLEASE...
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