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Removing a set of Duplicate lines from a file


 
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# 1  
Old 01-27-2013
Linux Removing a set of Duplicate lines from a file

Hi,

How do i remove a set of duplicate lines from a file.

My file contains the lines:
Code:
abc
def
ghi
 
abc
def
ghi
 
jkl
mno
pqr
 
jkl
mno
pqr
 
stu
vwx
yza

My output should look like:

Code:
abc
def
ghi
 
jkl
mno
pqr
 
stu
vwx
yza

Please let me know if this is not clear..

Thanks in advance.

-SREENIVAS
# 2  
Old 01-27-2013
Assuming that a blank line (no other character) separates your groups, try:
Code:
awk '!a[$0]++' RS= ORS='\n\n' file

 

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