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Searching inverted lines

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# 1  
Old 02-20-2012
Searching inverted lines
Hi fellas,
I have a file like this:
A_B
B_D
C_D
D_B
E_F
G_H
B_A
F_E

In other words, I have member1_member2 and member2_member1 in the same file. In the exemple aforementioned I have A_B and B_A, B_D and D_B, E_F and F_E.

So, I would like to know a sript that print the lines B_A, D_B and F_E (the inverted lines) in a new file.

Can you help me?
# 2  
Old 02-20-2012
Code:
awk -F_ '{a[$2"_"$1]=1}$0 in a' file

# 3  
Old 02-20-2012
Valente,

Please try with the below command:

Code:
 awk -F _ '{print $2"_"$1}' filename >new_filename.



Moderator's Comments:
Mod Comment Please use next time code tags for your code and data
Last edited by vbe; 02-20-2012 at 10:30 AM..
# 4  
Old 02-20-2012
Thanks bartus11. It worked fine.
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