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Commenting lines in a file using SED

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# 1  
Old 03-01-2010
Commenting lines in a file using SED
Hi,

I need to comment the below lines in a file using sed.These are the few lines of the jsp file that need to be commented.

Code:
if(top.location != location){
      top.location.href = location.href;
}

Using the below command two lines can be commented:
Code:
if(top.location != location){
     top.location.href = location.href;

Code:
sed -i -e 's:if(top.location != location){://if(top.location != location){:' -i -e 
's:top.location.href = location.href;://top.location.href = location.href;:' header.jsp

but I am not sure how to comment the line having } as there are many other lines having }.

.Is there a way I can merge lines top.location.href = location.href; and } then comment them?
Last edited by meetu; 03-02-2010 at 03:07 AM.. Reason: Use code tags, please!
# 2  
Old 03-01-2010
It seems you're using GNU sed, so you could try something like this:

Code:
sed -i '/if(top.location != location){/{
N;N;/if(top.location != location){\ntop.location.href = location.href;\n}/ {
s|^|//|mg
  }
}' infile

# 3  
Old 03-01-2010
after I ran this code my lines are not getting commented at all.and when I run this piece of code in my perl script.It gives me error
Code:
perl postinstall.pl 
sed: -e expression #1, char 67: unterminated address regex

Code:
#!/usr/local/bin/perl
&post_install_actions();
sub post_install_actions
 {
        $file = "/folder_struct/header.jsp";
        #`sed -i -e 's:if(top.location != location){://if(top.location != location){:' -i -e 's:top.location.href = location.href;://top.location.href = location.href;:' $file`;
 
`sed -i -e'/if(top.location != location){/{
N;N;/if(top.location != location){\ntop.location.href = location.href;\n}/ {
s|^|//|mg
  }
}' $file`;

}
Last edited by Yogesh Sawant; 03-01-2010 at 01:32 PM.. Reason: added code tags
# 4  
Old 03-01-2010
This may do what you want if each section starts with "if(top.location" and ends with a curly brace at the begging of a line
Code:
 sed '/if(top.location/,/^}/s/^/\/\//' header.jsp

# 5  
Old 03-02-2010
sed '/if(top.location/,/^}/s/^/\/\//' header.jsp does not work correctly.

comments all the lines in the files after the lines I want to comment.I
if(top.location != location){
top.location.href = location.href;
}
I only want to comment these three lines in the file.
Last edited by meetu; 03-02-2010 at 02:38 AM..
# 6  
Old 03-02-2010
Wrench
this should do it,

# invoke sed with the -n option to suppress it's normal output
# ie. sed -n -f add_comments input_file > output_file


/^if(top.location != location){$/{
:comment_lines
{
s/^/\\\\/
p
n
/^}$/! b comment_lines
s/^/\\\\/
}
}
p
# 7  
Old 03-02-2010
Hi Czk,

I am actually new to sed .Could you please elaborate ur answer.I did not get it.Cant I merge the }in the third line with the second line and then comment the whole line.
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