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The ex command <code>g</code> is very useful for acting on lines that match a pattern. You can use it with the <code>d</code> command, to delete all lines that contain a particular pattern, or all lines that do not contain a pattern.
 
The ex command <code>g</code> is very useful for acting on lines that match a pattern. You can use it with the <code>d</code> command, to delete all lines that contain a particular pattern, or all lines that do not contain a pattern.
   
For example, to delete all lines containing "profile" (the first command is optional; it shows the lines that the second command will delete):
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For example, to delete all lines containing "profile" (remove the <code>/d</code> to show the lines that the command will delete):
 
<pre>
 
<pre>
:g/profile
 
 
:g/profile/d
 
:g/profile/d
 
</pre>
 
</pre>
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</pre>
 
</pre>
 
But again I think the faster way to do that is to use :[range]d several times.
 
But again I think the faster way to do that is to use :[range]d several times.
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How would you instead of deleting, replace matched lines with a ''single'' newline between remaining lines?

Latest revision as of 14:24, August 5, 2014

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created 2002 · complexity basic · author tarjei · version 5.7


The ex command g is very useful for acting on lines that match a pattern. You can use it with the d command, to delete all lines that contain a particular pattern, or all lines that do not contain a pattern.

For example, to delete all lines containing "profile" (remove the /d to show the lines that the command will delete):

:g/profile/d

More complex patterns can be used, such as deleting all lines that are empty or that contain only whitespace:

:g/^\s*$/d

To delete all lines that do not contain a pattern, use g!, like this command to delete all lines that are not comment lines in a Vim script:

:g!/^\s*"/d

Note that g! is equivalent to v, so you could also do the above with:

:v/^\s*"/d

The next example shows use of \| ("or") to delete all lines except those that contain "error" or "warn" or "fail" (:help pattern):

:v/error\|warn\|fail/d

See alsoEdit

CommentsEdit

Can we remove all even numbered lines in a file using this feature. can we do some kind of math in the pattern. (ex: \=line(".") % 2)

Not really, but you can do that in two steps:

:g/.*/if line('.')%2|call setline(line('.'), '===delete===')|endif
:g/^==delete==$/d

If you simply put delete inside the if statement all the lines will be deleted. Much faster solution is to record a macro "ddj" and play it over the file. You could delete lines from several different ranges:

:let range = range(10,15)+range(20,25)+range(30,35)
:g/.*/if index(range, line('.')) != -1|call setline(line('.'), '===delete===')|endif
:g/^===delete===$/d

But again I think the faster way to do that is to use :[range]d several times.

How would you instead of deleting, replace matched lines with a single newline between remaining lines?

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