The standard J command for joining lines replaces the newline character(s) with a space. It's useful when editing 'literature' but can be troublesome if I, say, edit a hex dump by hand if I forget to remove the superfluous space.

Is there a quick & easy method to join two lines without producing a space between them?


The gJ combination does this; from :help gJ:

Join [count] lines, with a minimum of two lines. Don't insert or remove any spaces.

You could rebind it to J, if you wanted to save a keystroke:

:nnoremap J gJ

Note that this doesn't remove any spaces, so if either the current line ends with a space or next line starts with one or more spaces, they will be left as is.




Hello    world

We could use Jx in this case, then it will be Helloworld, but that won't work in all cases; from the help:

Join the highlighted lines, with a minimum of two lines. Remove the indent and insert up to two spaces


These commands, except "gJ", insert one space in place of the unless there is trailing white space or the next line starts with a ')'.

So in some cases more than one space or no space is inserted. As far as I can see, there is no easy way to change this behaviour; I created a function to modify gJ to always join without spaces:

" Like gJ, but always remove spaces
fun! JoinSpaceless()
    execute 'normal gJ'

    " Character under cursor is whitespace?
    if matchstr(getline('.'), '\%' . col('.') . 'c.') =~ '\s'
        " When remove it!
        execute 'normal dw'

" Map it to a key
nnoremap <Leader>J :call JoinSpaceless()<CR>

See also: :help J, :help 'joinspaces'

  • Is it possible to use some "Preserve" function to keep the cursor position when using this function or how do I get this result? – SergioAraujo Dec 15 '17 at 12:19

Another trick you may try is to use replace. Sometimes this might be useful.


Scenario: Delete the last character and join with the next line:


For example,




Create a macro and reuse it:


Now replay the macro, a by using @a wherever you want to join two lines with no space.

@@ will repeat the previous macro. So you can just hold @ to join multiple lines.

  • 1
    Why type @a when you can type Jx? Same number of key presses and SHIFT presses! – Shahbaz Jan 19 '17 at 1:37
  • 1
    @Shahbaz Maybe because of the last line: "you can just hold @" – muru Jan 19 '17 at 3:13
  • 1
    @muru, that's true! – Shahbaz Jan 19 '17 at 15:23
  • 2
    It also makes it a repeatable command, so you can use 3@a to join 3 lines, whereas doing 3Jx would join 3 lines with spaces and then delete the space between the second and third lines, leaving spaces between the other lines. – Haegin Feb 27 '17 at 18:05

To always join with a single space :

nmap J gJi <ESC>ciW <ESC>

To join with no space at all (removes trailing+leading space) :

nmap <C-J> gJi <ESC>diW
  • 1
    Welcome to this site! Your mappings look a bit over-engineered to me, it would be helpful if you could add a bit more explanations about how they work. – statox Apr 9 at 15:31

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