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Removing a block of duplicate lines from a file

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# 8  
Old 12-13-2012
Just for fun:
Code:
$ cat infile
abc
123
;
rao
bell
;
call
abc
123
;
rao
bell
;

Output:
Code:
$ sed '1h;1!H;$!d;$g;s/\(.*\)\(.*\)\n\1/\1\2/' infile
abc
123
;
rao
bell
;
call

This User Gave Thanks to Scrutinizer For This Post:
raosr020
# 9  
Old 12-14-2012
Thank you all!! I got my requirement!!

---------- Post updated at 05:59 PM ---------- Previous update was at 05:25 PM ----------

Thank you all! I got it!!
# 10  
Old 12-14-2012
clap clap!

The following variants run the RE only on the last line (and are faster?):

Code:
sed '1h;1!H;$!d;${g;s/\(.*\)\(.*\)\n\1/\1\2/;}'

Code:
sed -n '1h;1!H;${g;s/\(.*\)\(.*\)\n\1/\1\2/;p;}'

Last edited by Scrutinizer; 12-14-2012 at 08:37 AM.. Reason: icode ===>>> code tags
# 11  
Old 12-14-2012
Hi MadeInGermany, thanks Smilie. My suggestion also only works on the last line, because of the $!d which stops executing the code for every line except the last one and reads the next line... The $ before the g is therefore not necessary:
Code:
sed '1h;1!H;$!d;g;s/\(.*\)\(.*\)\n\1/\1\2/' file

Last edited by Scrutinizer; 12-14-2012 at 08:52 AM..
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