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Commenting a specific line and inserting a new line after commented line.

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Top Forums Shell Programming and Scripting Commenting a specific line and inserting a new line after commented line.
# 8  
Old 12-17-2012
I left out a trailing slash. Try:
Code:
sed 's/^line=.*/#&\
line=ffffff/' file

--edit--
Don Cragun beat me to it Smilie
Last edited by Scrutinizer; 12-17-2012 at 05:28 PM..
This User Gave Thanks to Scrutinizer For This Post:
manishdivs
# 9  
Old 12-17-2012
Quote:
Originally Posted by Scrutinizer
Try:
Code:
sed 's/^line=.*/#&\
line=ffffff/' file

Hello,

Once I insert a new line then I would like to put some comment in front of that line.

I am able to achieve this using following separate command:
Code:
sed 's/\(^line=.*\)/\1 #Code Change Comment/' manish

But I wonder if I can achieve this within previous command. I did try options but not succeeded.

Please help me if there is any way to get this.

Thanks.
# 10  
Old 12-17-2012
Hi, I am not sure what you mean, one of these?

Code:
$ sed 's/^line=.*/#&\
line=ffffff    # code change/' file
#line=aaaaaa
#line=bbbbbb
#line=cccccc
#line=dddddd
#line=eeeeee
line=ffffff    # code change
#comment=11111
#comment=22222
#comment=33333
#comment=44444
comment=55555

Code:
$ sed 's/^line=.*/#&   #code change\
line=ffffff/' file
#line=aaaaaa
#line=bbbbbb
#line=cccccc
#line=dddddd
#line=eeeeee   #code change
line=ffffff
#comment=11111
#comment=22222
#comment=33333
#comment=44444
comment=55555

# 11  
Old 12-17-2012
Yes. Got it!! Thanks.

Code:
sed 's/^line=.*/#&\
line=$restoreufs   $comment/' manish

where
Code:
restoreufs="line=ffffff"
comment="This comment line"

When I am trying to read restoreufs & comment variable values then it is not able to expand $restoreufs and $comment values
Output:
Code:
#line=eeeeee
line=$restoreufs   $comment
#comment=11111

I tried to use "double cotes" and "eval" then instead of inserting a new line it is appending data in existing line

Code:
sed "s/^line=.*/#&\
line=$restoreufs   $comment/" manish

OR
Code:
eval "sed 's/^line=.*/#&\
line=$restoreufs   $comment/' manish"

Output:
Code:
#line=dddddd
#line=eeeeeeline=line=ffffff   This comment line
#comment=11111

Que: How to display the variable values correctly in new line.

My actual command in script is:
Code:
sed 's/^restoredb2=.*/#&\
restoredb2=$restoredb2_value   # $comment/' /home/script/restore_$(basename $PWD).sh

Last edited by manishdivs; 12-17-2012 at 08:21 PM..
# 12  
Old 12-17-2012
Try combining single quotes and double quotes, for example:
Code:
sed 's/^line=.*/#&\
'"$restoreufs    # $comment/" file



or use an extra escape for the escape character itself:
Code:
sed "s/^line=.*/#&\\
$restoreufs    # $comment/" file

# 13  
Old 12-17-2012
Try it like this:
Code:
restoreufs="line=ffffff"
comment="This comment line"

sed "s/^line=.*/#&\
\n${restoreufs}   ${comment}/" file

$ test.sh
#line=aaaaaa
#line=bbbbbb
#line=cccccc
#line=dddddd
#line=eeeeee
line=ffffff   This comment line
#comment=11111
#comment=22222
#comment=33333
#comment=44444
comment=55555

# 14  
Old 12-18-2012
Code:
sed "s/^restoredb2=.*/#&\\
restoredb2=$restoredb2_value   # $comment/" restore_$(basename $PWD).sh

I am using above command to look for a line starting with word "restoredb2=" and commenting it. Also, I am inserting new data line in the immediate next line.

Issue: When I am running above command then it is not able to read a line starting with space and followed by my search string.

For example::
Able to read:
Code:
restoredb2=testing12345

But not able to read
Code:
  restoredb2=testing12345 (Please note initial 2 spaces)


Please help me to modify command to work similarly in case it find search string directly or find it with leading spaces.

Thank you.
Last edited by manishdivs; 12-19-2012 at 02:44 PM..
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