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Printing out lines that have the same value in the first column but different value in the second

 
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# 1  
Old 02-12-2013
Printing out lines that have the same value in the first column but different value in the second
Hi,

I have a text file that looks like the following:

Code:
ILMN_1343291    6       74341083        74341772
ILMN_1343291    6       74341195        74341099
ILMN_1343295    12      6387581 6387650
ILMN_1651209    1       1657001 1657050
ILMN_1651209    5      83524260        83524309

I would like to print out all the lines where the values in the first column match but the values in the second column do not match, so the resulting output would look like the following:

Code:
ILMN_1651209    1       1657001 1657050
ILMN_1651209    5      83524260        83524309

Thanks!
# 2  
Old 02-12-2013
Code:
awk 'f==$1&&s!=$2{print c;print}{f=$1;s=$2;c=$0}' file

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