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change requires with perl

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# 1  
Old 09-19-2008
change requires with perl
Hi,

i need to change a file with perl having contents below, but it will not do any action if change is being already made.

file.txt
AAAAAA
BBBBBB
CCCCCC

output.txt (that required)

AAAAAA
#BBBBB
DDDDDD

CCCCCC


Thanks,
# 2  
Old 09-19-2008
sed is easier...
Code:
sed 's/^BBBB/#&/'  file > newfile

# 3  
Old 09-19-2008
Hi jim,

its so nice you see my post answer, but lets see there are two points, lets suppose i want to comment a particular line number with "#" and wants to add one line text on particular line number, for example i want to comment 45th line and wants to add another line after 90th line and if it is already done so it wont do anything how can i put this.

Thanks, pls advice.
bash
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