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awk if/substring/append help

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# 1  
Old 11-09-2011
Question awk if/substring/append help
Hi All,

I need some help with an awk command:

What I'm trying to do is append "MYGROUP: " to text with the substring "AT_"

the input file follows this format:
Code:
AT_xxxxxx
Name1
Name2
AT_xxxxxx
NameA
NameB

I want the output to be:
Code:
MYGROUP: AT_xxxxx
Name1
Name2
MYGROUP: AT_xxxxx
NameA
NameB

My command is:
Code:
awk '{if (substr($1,1,3)=="AT_") b="MYGROUP: "; print b$1} ' input.txt > output.txt

It executes but not with the expected output. Any ideas?

Thanks in advance

Moderator's Comments:
Mod Comment Video tutorial on how to use code tags in The UNIX and Linux Forums.
Last edited by Franklin52; 11-09-2011 at 06:12 AM.. Reason: Please use code tags, thank you
# 2  
Old 11-09-2011
Code:
awk '/^AT_/{$0="MYGROUP: " $0}1' file

# 3  
Old 11-09-2011
Franklin, that did the trick. Thanks a lot!
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