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Help with Pattern match and replace

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# 1  
Old 04-23-2012
Help with Pattern match and replace
I have a file containing a multiple lines of the format
Code:
sddfdsf_gaf/ywrtrtwrt_gaf
ghfghfgh_ert/xcvxcvcv_ert
werwerwwerw_adf/jkhjkhjkjhkjhk_adf

I am interested in only the first 3 letters following the "_" character and make those 3 letters uppercase after extraction. So would like to convert the file into something like this.
Code:
GAF
ERT
ADF

Any ideas?
Last edited by Franklin52; 04-23-2012 at 03:31 AM.. Reason: Code tags
# 2  
Old 04-23-2012
Hi

Code:
$ awk -F"_" '{print toupper(substr($2,0,3));}' file

Guru.
# 3  
Old 04-23-2012
Code:
awk -F'_' {'print $2'} sourcefile|cut -c-3| tr '[:lower:]' '[:upper:]'

# 4  
Old 04-23-2012
Try:
Code:
awk -F_ '{print toupper($NF)}' infile

# 5  
Old 04-23-2012
Code:
sed 's/_\(...\)/_\U\1/' infile

# 6  
Old 04-23-2012
Note: \U is GNU sed..
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