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Shell Programming and Scripting

Insert a character before a line

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# 1  
Old 07-17-2013
Insert a character before a line
I have a file and I can get the line with a specific pattern. I want to inset # on start of the line.

file.text
====
Code:
aa bb cc
bb hh kk
kk ll yy
dd aa kk
rr tt aa

I want to comment out the line with contain "aa"

after running the script

file.text
====
Code:
#aa bb cc
bb hh kk
kk ll yy
#dd aa kk
#rr tt aa

please let me know how can I do this??
Last edited by joeyg; 07-17-2013 at 09:24 AM.. Reason: Please wrap commands/scripts and data within CodeTags - easier to read
# 2  
Old 07-17-2013
with sed:
Code:
sed 's/.*aa.*/#&/g' file

with awk:
Code:
awk '/aa/{printf "#"}1' file

Last edited by Subbeh; 07-17-2013 at 09:50 AM..
# 3  
Old 07-17-2013
suppose I have store the whole line in a variable. could you please tel me how can I insert # on this line?
# 4  
Old 07-17-2013
Are you talking of shell variables?
Code:
line="#"$line

# 5  
Old 07-17-2013
file.txt
Code:
aa bb cc
bb hh kk
kk ll yy
dd aa kk
rr tt aa

var=bb hh kk

now i want to replace line "bb hh kk" with "#bb hh kk" using variable $var.
Last edited by Scott; 07-17-2013 at 10:12 AM.. Reason: Use code tags, please...
# 6  
Old 07-17-2013
Quote:
Originally Posted by RudiC
Are you talking of shell variables?
Code:
line="#"$line

This is the answer to your question.!
# 7  
Old 07-17-2013
i think it can modify the variable. but I have to replace the line..
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