Re: Replace Text in the middle of string with wild character

On 08/08/12 06:10, KRiTs wrote:
> I have large file which has following lines
> 
> <SHOUT DEST="ECS" MESSAGE="JOBNAME HAS ENDED NOTOK" URGENCY="R" WHEN="NOTOK"/>
> 
> Now I want append a word after MESSAGE=" with a condition that the line ends with WHEN="NOTOK"/> 
> 
> as there are other lines ending with WHEN="OK"/> which should not be touched.
> 
> Challenge is the actual text within MESSAGE "" would vary
> 
> I tried \1 \2 option also but to no avail.

You were on the right track with the \1 notation, but you don't
mention what you tried.  I used the following and it seemed to do
what you describe (though I don't know whether you want to add text
"before" or "after", so you can modify accordingly as you see fit):

sed '/WHEN="NOTOK"/s/MESSAGE="\([^"]*\)"/MESSAGE="before \1 after"/'
large_file.txt


which roughly translates to "on lines that match /WHEN="NOTOK"/
capture the MESSAGE="..." contents and then replace them with your
modifications, inserting the original text back in as \1"

-tkc