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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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*[[VimTip1557|Filter buffer on a search result]]
 
*[[VimTip1557|Filter buffer on a search result]]
 
*[[VimTip282|Folding with Regular Expression]]
 
*[[VimTip282|Folding with Regular Expression]]
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*[[VimTip227|Power of g]]
   
 
==Comments==
 
==Comments==
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  +
Can we delete/not delete the line that precedes the search string?
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  +
like, in the below example i want the command to search for "keyword" and then ratain that and the line before that and deletes the test? Thank you!
  +
  +
<< file starts>>
  +
  +
this is the line that preceeds the search string
  +
  +
keyword
  +
  +
asdfgf asdfgf
  +
  +
lkjhj lkjhj
  +
  +
<< file ends>>
  +
  +
:Easy, supply a [[Range]] to the <code>d</code> command: <code>:g/keyword/-1d</code>. --[[User:Fritzophrenic|Fritzophrenic]] ([[User talk:Fritzophrenic|talk]]) 22:09, May 20, 2015 (UTC)
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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)
 
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)
   
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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 22:09, May 20, 2015

Tip 213 Printable Monobook Previous Next

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 delete/not delete the line that precedes the search string?

like, in the below example i want the command to search for "keyword" and then ratain that and the line before that and deletes the test? Thank you!

<< file starts>>

this is the line that preceeds the search string

keyword

asdfgf asdfgf

lkjhj lkjhj

<< file ends>>

Easy, supply a Range to the d command: :g/keyword/-1d. --Fritzophrenic (talk) 22:09, May 20, 2015 (UTC)

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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