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Old 04-23-2007, 04:07 PM   #1
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Question how do I delete *certain* lines in vi editor?


This is my first post here. Looks like a very active forum!

I am looking for a way to search a file for a specific string, and find all of the lines that contain that string.

Then - delete all of those lines without changing any of the other lines.

Is this possible in vi?

This is an especially large file, so I want it to happen all at once instead of having to confirm each deleted line.


Old 04-23-2007, 04:17 PM   #2
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Why not use sed? For example, to delete all the line containing the string B. Gates
sed -i "/B. Gates/d" filename
Of course, make a copy of the file first!!

[EDIT:] Ooops! Revised the command so it does in-place editting.

Last edited by weibullguy; 04-24-2007 at 08:58 AM.
Old 04-23-2007, 07:54 PM   #3
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If you prefer a more "manual" way using vi, use grep to find all occurences of the line and the number of the line where it appears in the file, for instance:
grep -n B.\ Gates /directory_to/filename
The (-n) will list all line numbers in the file where B. Gates is, with vi you place the cursor at the beginning of these lines and type: 'dd' to remove the line. You can also use the grep command and pipe it to "rm" to automate. Back up the file first and try on a copy as suggested above.

EDIT: Of course, both of these examples are bash and not vi, I don't think you can automate with vi. Type: 'vimtutor' in a terminal to take a little course for using vi/vim.

Last edited by Junior Hacker; 04-23-2007 at 08:04 PM.
Old 04-23-2007, 08:39 PM   #4
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Originally Posted by Arow
Why not use sed? For example, to delete all the line containing the string B. Gates
sed "/B. Gates/d" filename
Of course, make a copy of the file first!!
And if you actually want the file changed, use the -i flag ... ;}



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