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Old 03-19-2008, 06:59 PM   #1
Romanus81
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Comment/uncomment lines?

I am trying to write a bash script that will remove a comment out of the beginning of a line, so far I know that with the command, [vi +4 file] it will open to line four of the file I need to edit, all I need is for the script to add or remove the comment. I don't know if there is a simpler way or some function of vi I am not understanding.
 
Old 03-19-2008, 07:28 PM   #2
osor
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So you want to remove all instances of ‘#’ at the beginning of the fourth line?

How about:
Code:
sed -i '4s/^#*//' file
Or if you must use vi/ex:
Code:
ex -c '4s/^#*//|wq' shell.sh
 
Old 03-27-2008, 09:07 PM   #3
Romanus81
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Ok, that worked, thank you. I used the method with sed.
But how do I add it back in?
 
Old 03-27-2008, 09:13 PM   #4
osor
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Quote:
Originally Posted by Romanus81 View Post
But how do I add it back in?
You mean you want to add a hash mark to the beginning of line 4?
Code:
sed -i '4s/^/#/' file
 
Old 03-31-2008, 08:25 PM   #5
Romanus81
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thank you so much, this makes my life a lot easier!
 
  


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