Deleting the similar lines


 
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# 1  
Old 02-02-2009
Deleting the similar lines

Dear Friends
myself Avinash working in bash shell
The problem goes like this
I have a file called work.txt [ the content of the file as follows]
assume that
first colum=mac address
second colum= IP
third colum = port number
----------------------------------------
00:12:23:34 192.168.50.1 2
00:12:23:35 192.168.50.1 5
00:12:23:36 192.168.50.1 8
00:12:23:34 192.168.50.1 2
00:12:23:37 192.168.50.1 12
00:12:23:38 192.168.50.1 14
00:12:23:39 192.168.50.1 11
00:12:23:34 192.168.50.1 2
-----------------------------------------
as u can observe the line "00:12:23:34 192.168.50.1 2" has repeated 3 times

my problem is i want to suppress all repeated lines to single line ie i want the output as
---------------------------------
00:12:23:34 192.168.50.1 2
00:12:23:35 192.168.50.1 5
00:12:23:36 192.168.50.1 8
00:12:23:37 192.168.50.1 12
00:12:23:38 192.168.50.1 14
00:12:23:39 192.168.50.1 11
------------------------------
Thanks for every one
Avinash. Smilie
# 2  
Old 02-02-2009
cat work.txt | sort -u > new_work.txt
# 3  
Old 02-02-2009
Found here: http://student.northpark.edu/pemente/sed/sed1line.txt (Thank you very much to the author - Mr. Eric Pement...got me through a lot SmilieSmilie)

Code:
sort foo | sed '$!N; /^\(.*\)\n\1$/!P; D'

or

Code:
sed -n 'G; s/\n/&&/; /^\([ -~]*\n\).*\n\1/d; s/\n//; h; P' foo

You may also want to look at the uniq command

Code:
sort foo | uniq -u
sort foo | uniq -d
sort foo | uniq -c | awk '{print $NF}'


Last edited by angheloko; 02-02-2009 at 05:54 AM.. Reason: Added uniq...Should have thought about that earlier...
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