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Using sed to find text between a "string " and character ","

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Top Forums Shell Programming and Scripting Using sed to find text between a "string " and character ","
# 8  
Old 12-14-2011
Thanks Ahamed. Can you be a little more precise with adding extra parts to the echo/awk command? The current commands are very similar as they are. I am just being introduced to awk and sed so please forgive my lack of knowledge.

Here is some sample data;
Code:
Wed Dec 14 04:41:36 2011 SENT CONTROL [server]: 'PUSH_REQUEST' (status=1)
Wed Dec 14 04:41:36 2011 PUSH: Received control message: 'PUSH_REPLY,route-gateway 197.73.129.164,redirect-gateway def1,dhcp-option DNS 208.67.220.220,dhcp-option DNS 8.8.8.8,dhcp-option DNS 208.67.222.222,route-gateway 197.73.129.164,ping 10,ping-restart 30,ifconfig 197.73.129.170 255.255.255.240'
Wed Dec 14 04:41:36 2011 OPTIONS IMPORT: timers and/or timeouts modified
Wed Dec 14 04:41:36 2011 OPTIONS IMPORT: --ifconfig/up options modified
Wed Dec 14 04:41:36 2011 OPTIONS IMPORT: route options modified
Wed Dec 14 04:41:36 2011 OPTIONS IMPORT: route-related options modified
Wed Dec 14 04:41:36 2011 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified

It is the DNS server IP's that need to be obtained.

The following creates the resolv.conf
Code:
awk '{gsub(/,/, "\n" );gsub(/DNS/, "nameserver" );}; {for(i=1;i<=NF-1;i+=3) {print ($ (i),($ (i+1)))}}' log | grep -m 3 nameserver > /tmp/etc/resolv.conf

Again your help is much appreciated.
# 9  
Old 12-14-2011
My version...
Code:
awk -F, '/DNS/{for(i=1;i<=NF;i++){if($i~"DNS"){gsub(".* ","nameserver ",$i);print $i}}}' log

I just did an echo and it worked.
Code:
root@bt:/tmp# echo awk -F, '/DNS/{for(i=1;i<=NF;i++){if($i~"DNS"){gsub(".* ","nameserver ",$i);print $i}}}' log
awk -F, /DNS/{for(i=1;i<=NF;i++){if($i~"DNS"){gsub(".* ","nameserver ",$i);print $i}}} log

which is your OS?

--ahamed
# 10  
Old 12-14-2011
It is part of a generic DD-WRT/openwrt script I am creating to allow users to more easily connect to an openvpn server.

The script is stored in the nvram of a DD-WRT router, and when extracted it is executed line by line. There is only one script area available in the http input area, but multiple are files needed, so I need to use echo to create those files, each in the form.

The script is executed everytime the openvpn client successfully connects or reconnects
Code:
echo"#!/bin/sh
if [ -e log ]
awk.......log | grep ... > file
fi
(other commands)
" > script.sh
chmod +x script.sh

The above didnt work, this helped.
Code:
echo"#!/bin/sh
if [ -e log ]"> script.sh
echo awk.......log '| grep ... > file' >>script.sh
echo "fi
(other commands)
" >> script.sh
chmod +x script.sh

However then I realised; the command after echo is still not working. Note that the ' marks have been taken away. to get around this "\'" must be used.
Code:
echo awk -F, \''/DNS/{for(i=NF;i>1;i--){if($i~"DNS"){gsub(".* ","nameserver ",$i);print $i}}}'\' l
og

Note that I changed the for loop to search backwards from the end.

Finally, although not as great an issue; Can awk stop after it gets a specific number of results? There are many lines like this containing DNS values, only the 3 are needed. The file may also get rather long so cutting on cpu time and stopping, once the information is obtained, is preferable.

Thanks again, I think almost there!
# 11  
Old 12-14-2011
Quote:
Originally Posted by haggismn
Finally, although not as great an issue; Can awk stop after it gets a specific number of results? There are many lines like this containing DNS values, only the 3 are needed. The file may also get rather long so cutting on cpu time and stopping, once the information is obtained, is preferable.
Just add a count which you can check and call exit.
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