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delete trailing whitespace from end of each line in column 1 only

 
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# 1  
Old 01-12-2012
delete trailing whitespace from end of each line in column 1 only
Hi All.
How can I convert this:

Code:
ABC_1_1
ABC_1_2
ABC_1_3

into this:
Code:
ABC_1   1
ABC_1   2
ABC_1   3

I tried this command but it is not working:
Code:
awk '{sub(/[_]+$/,"\t", $1)}{print}'

Any suggestions on how to fix this?
Thank you Smilie
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!
Last edited by vgersh99; 01-12-2012 at 04:27 PM.. Reason: code tags, PLEASE!
# 2  
Old 01-12-2012
Try:
Code:
perl -pe 's/_([^_]+)$/ \1/' file

# 3  
Old 01-12-2012
I tried ur perl command but it is not removing the 2nd underscore ... Smilie
# 4  
Old 01-12-2012
How about this:

Code:
perl -pe 's/(\w+_\d)_(\d)/$1 $2/g' file.txt

 
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