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How to use SED or AWK to search and replace an exact string


 
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Top Forums Shell Programming and Scripting How to use SED or AWK to search and replace an exact string
# 1  
Old 06-29-2011
How to use SED or AWK to search and replace an exact string

I have a file
HTML Code:
DS1
DDS
DS
I want to replace only "DS" to "DSmail.blah.com" in a lot of files. I tried

sed 's/DS/DSmail.blah.com' but it changes all the lines .

thanks in advance
# 2  
Old 06-29-2011
sample:

Code:
 
$sed 's/^DS$/abc/' test
DS1
DDS
abc

# 3  
Old 06-29-2011
Code:
 
perl -pe 's/\bDS\b/blah/' input
DS1
DDS
blah


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