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Unix Shell script to edit a file.

Posted on 2013-01-10
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Last Modified: 2013-11-15
Hi Experts , I am looking for a script which i do this task repeatedly.

I am running a task that will create a file called diff_file. I want to back up this original diff_file in /tmp directory  and rename the diff_file to diff_change.
In the diff_change file I want to remove all the lines starting with <URL> and replace the strings :

tshost to host
tslat to lat
autodev to autoapp
100 to 200
gdev to mep
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Question by:07592161981m
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farzanj earned 500 total points
ID: 38765597
cp diff_file /tmp/diff_file.bak
mv diff_file diff_change
sed -i '/^<URL>/d;s/tshost/host/;s/tslat/lat/;s/autodev/autoapp/;s/100/200/;s/gdev/mep/' diff_change

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by:07592161981m
ID: 38765787
Thank you for the response. If I Want to remove only the urls in the file , what will be the script.
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by:farzanj
ID: 38765921
Are your URLs starting with http?

you can do like

sed -i '/http:/d' filename

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Author Comment

by:07592161981m
ID: 38765946
The file is an xml file and the url line  start with <URL>http://...</URL>
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Expert Comment

by:farzanj
ID: 38765954
Oh, so you can simply use:

sed -i '/<URL>/d' filename

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Expert Comment

by:ahoffmann
ID: 38766080
# farzanj's first suggestion corrected and improved:

cp diff_file /tmp/
sed -i '/^<URL>/d;s/tshost/host/g;s/tslat/lat/g;s/autodev/autoapp/g;s/100/200/g;s/gdev/mep/g' diff_file > diff_change

# note that this will change also:  lasthosts to lashost  and 1001 to 2001
# hope your want that
# > remove all the lines starting with
# we take that requirement verbatime, means no leading spaces allowed
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by:farzanj
ID: 38766680
@ahoffmann
My solution was correct and I had tested it.  Just putting globals (which was not mentioned by the asker) does not constitute correction.  You have essentially given my solution again

IMHO you need to correct you solution because when you use sed -i, you don't get any output and therefore your diff_change file will be empty.  Yes, you can remove -i and then it would work but IMHO, I am giving a point my point solution as was asked.
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Expert Comment

by:ahoffmann
ID: 38766757
@farzanj, you're right, it must be sed -e instead -i (c&p error)

just see that this question is in cygwin topic, I guess there need to be other solutions posted ;-)
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