How to insert text at beginning of a multi-line selection in vi/Vim

• Press Esc to enter 'command mode'
• Use Ctrl+V to enter visual block mode
• Move Up/Downto select the columns of text in the lines you want to comment.
• Then hit Shift+i and type the text you want to insert.
• Then hit Esc, wait 1 second and the inserted text will appear on every line.

For further information and reading, check out "Inserting text in multiple lines" in the Vim Tips Wiki.

This replaces the beginning of each line with "//":

:%s!^!//!

This replaces the beginning of each selected line (use visual mode to select) with "//":

:'<,'>s!^!//!

Note that gv (in normal mode) restores the last visual selection, this comes in handy from time to time.

Another way that might be easier for newcomers:

 some█
 code
 here

Place the cursor on the first line, e.g. by

gg

and type the following to get into insert mode and add your text:

I / / Space

 // █some
 code
 here

Press Esc to get back to command mode and use the digraph:

j . j .

 // some
 // code
 //█here

j is a motion command to go down one line and . repeats the last editing command you made.

And yet another way:

• Move to the beginning of a line
• enter Visual Block mode (CTRL-v)
• select the lines you want (moving up/down with j/k, or jumping to a line with [line]G)
• press I (that's capital i)
• type the comment character(s)
• press ESC

This adds # at the beginning of every line:

:%s/^/#/

And people will stop complaining about your lack of properly commenting scripts.

If you want to get super fancy about it, put this in your .vimrc:

vmap \c :s!^!//!<CR>
vmap \u :s!^//!!<CR>

Then, whenever in visual mode, you can hit \c to comment the block and \u to uncomment it. Of course, you can change those shortcut keystrokes to whatever.

Yet another way:

:'<,'>g/^/norm I//

/^/ is just a dummy pattern to match every line. norm lets you run the normal-mode commands that follow. I// says to enter insert-mode while jumping the cursor to the beginning of the line, then insert the following text (two slashes).

:g is often handy for doing something complex on multiple lines, where you may want to jump between multiple modes, delete or add lines, move the cursor around, run a bunch of macros, etc. And you can tell it to operate only on lines that match a pattern.

To insert "ABC" at the begining of each line:

1. Go to command mode

2. % norm I ABC

I can recommend the EnhCommentify plugin.

eg. put this to your vimrc:

let maplocalleader=','
vmap <silent> <LocalLeader>c <Plug>VisualTraditional
nmap <silent> <LocalLeader>c <Plug>Traditional
let g:EnhCommentifyBindInInsert = 'No'
let g:EnhCommentifyMultiPartBlocks = 'Yes'
let g:EnhCommentifyPretty = 'Yes'
let g:EnhCommentifyRespectIndent = 'Yes'
let g:EnhCommentifyUseBlockIndent = 'Yes'

you can then comment/uncomment the (selected) lines with ',c'

In case someone's multi-line-selection is actually a paragraph, there is no need to manually select the lines. vim can do that for you:

1. vip: select and mark the whole paragraph
2. shift-i: insert text at line beginning
3. escape: leave insert mode/enter normal mode [line beginnings still selected]
4. escape: unselect line beginnings

Mapping of most voted answer:

1st visual select the desired lines, then execute <leader>zzz, which values:

vnoremap <leader>zzz <C-V>^I-<Space><Esc>

• <C-V> to enter visual mode
• ^ goes to start of line ( or use '0' to 1st non blank)
• I to insert in block mode
• -<Space> to insert '- ' (for example, edit as you need)
• <Esc> to apply same insert to all visual block lines

Or of last visual selection from normal mode:

nnoremap <leader>zzz gv<C-V>^I-<Space><Esc>