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Put a # in start of a specific line of a file

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# 1  
Old 06-04-2012
Put a # in start of a specific line of a file
Hello Guys
Please let me know how to solve the below issue

I have a file like below

Code:
 
drop table R1416.ABC1 cascade constraints;
drop table R1416.ABC2 cascade constraints;
drop table R1416.ABC3 cascade constraints;
drop table R1416.ABC4 cascade constraints;
drop table R1416.ABC5 cascade constraints;
drop table R1416.ABC6 cascade constraints;

If I got a input like ABC4 the file will be modified like below

Code:
drop table R1416.ABC1 cascade constraints;
drop table R1416.ABC2 cascade constraints;
drop table R1416.ABC3 cascade constraints;
#drop table R1416.ABC4 cascade constraints;
drop table R1416.ABC5 cascade constraints;
drop table R1416.ABC6 cascade constraints;

A hash will be added at the start of the file
# 2  
Old 06-04-2012
Code:
awk '/ABC4/{$0="#" $0}1' file > newfile

# 3  
Old 06-04-2012
Code:
awk '/ABC4/{print "#" $0}1' infile >outfile

Last edited by Franklin52; 06-04-2012 at 04:50 AM.. Reason: Please use code tags
# 4  
Old 06-04-2012
Hi


Code:
$ sed '/ABC4/s/^/#/' file

Guru.
# 5  
Old 06-04-2012
Revoked ..
Last edited by jayan_jay; 06-04-2012 at 04:06 AM.. Reason: Saw similar posts above, hence reverting ..
# 6  
Old 06-04-2012
Code:
perl -i.bak -lane 'if ($_=~/ABC4/){print "#$_";}else{print $_}' filename

You can see the backup file as filename.bak
# 7  
Old 06-04-2012
Thanks a lot everyone
Last edited by Pratik4891; 06-04-2012 at 05:47 AM..
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