How to execute specific regex substitution on selected lines in visual mode in vim - vim

I want to replicate the VS code feature of 'highlight and comment out code' (usually bound to keys SHIFT + /) in vim.
I can run :g//s/^/\/\/ / in normal mode to prepend // at the start of every line. I just want to put a constraint on this so it only applies the substitution to lines highlighted in visual mode.

Visually select all the lines (using V), then hit :.
This will give you :'<,'> which is the range of your visual selection.
Then you can add your vim command to it.
I would recommend the following method if you wish to not use plugins.
:'<,'>normal I//
Which is not a substitution.
If you want a really nice vim plugin that does this task in a vim manner, check out tpope's vim-commentary which is an essential in my opinion.

I can run :g//s/^/\/\/ / in normal mode to prepend // at the start of every line.
Well, that would be an unnecessarily complicated way to do it and your command wouldn't really work anyway.
:g// either matches nothing or it matches the previous search. What you want, here, is probably something like :g/^/ or :g/$/.
A simple substitution on the whole buffer would be much simpler and much faster:
:%s/^/\/\/ /
Using :help :global in this context provides no value (you want to operate on every line anyway) and is considerably slower (we are talking thousands of times slower)
You can use alternative separators to avoid all that backslashing:
:%s#^#// #
The last separator is not even needed:
:%s#^#// <-- there is a space, here
And the kicker: you can enter command-line mode from visual mode like you would do from normal mode, by pressing :. So you can simply make your visual selection, press :, and run your substitution:
v " enter visual mode
<motion> " expand the selection
: " press :
:'<,'> " Vim inserts the range covering the visual selection for you
:'<,'>s#^#// <CR> " perform your substitution

Related

Reference selection in Vim command mode to pass on to terminal

Is there something like % (that represents the whole buffer in Vim command line) for the current selection, so that I can do something like: :# sort (Imagine # represents the selection).
EDIT:
Sorry, I missed to mention that I am requesting for a way to operate on block selections not on ordinary selections that can be operated using ranges '<,'>.
Yes. Example:
:'<,'>!sort
The range :'<,'> represents the visually selected lines.
:* is shorthand for :'<,'>
If you hit : while in visual mode it will start the command with '<,'>
For more help see:
:h '<
:h v_:
:h range
You are probably looking for the marks '< and '>:
:'<,'>sort
If you just select a few lines and hit : to enter the command line these marks should appear automatically.
As others have already remarked, the visual selection is represented by the '<,'> range (there's also the :* short form). However, as all ranges, this always covers entire lines, even if the selection is only characters or a block.
Most Ex commands (like :sort) only operate on full lines, for :substitute, you can limit the effects to the visual selection by including the special \%V atom in the search pattern, cp. :help /\%V.
The idea to make Ex commands handle blockwise selections is old, but unlikely to be tackled any time soon.

How do I repeatedly search & replace a long string of text in vim?

I'm aware of the vim replace command, which is of the form, eg:
:%s/old/new/gc
But what if either of these strings is long? How can I use something like visual selection mode, the clipboard or vim registers instead of having to type the old/new text in?
You can use q: to bring up a command-line window. This lets you use all the vim editing commands to edit the vim command line, including p to paste. So, you could copy the text into a register, paste it into the command line window, and execute it that way.
I recently discovered this feature via vimcasts.
According to the manual, you can use Ctrl+R to insert the contents of a register into the current position in the command line. The manual also claims that Ctrl+Y inserts the text highlighted with the mouse into the command line. Remember that in X11 and some other systems, you can also paste text into a program from the system clipboard using the middle mouse button or a menu command in your terminal emulator.
I think to avoid have your command line be huge you can use this to solve your issue
:%s/foo/\=#a/g
That replaces "foo" with whatever is in register a.
If you're trying to do a substitute with a long complicated search pattern, here's a good way of going about it:
Try out the search pattern using some test cases and refine it until you have the pattern you want. I find incsearch really helps, especially with complicated regular expressions.
You can then use :%s//new to replace all instances of the last searched for pattern.
If you've entered a pattern and want to copy it out of the search history, you can use q/ to bring up a command line window containing recent search patterns very similar to the q: one that contains recent command history.
On the other hand, if you're asking about how to copy and paste text into the substitute command:
I'd write the pattern out in insert mode and yank the search and replacement into two distinct registers using, say, "ay and "by and then use :%s/<C-R>a/<C-R>b/gc to do the substitute. There are lots of variations of the yank command, but this one should also work automatically when using a visual selection.
If you're copying in text from the clipboard, you can use <C-R>* to paste it's contents in insert mode.
I have the following mapping in my .vimrc
vnoremap <leader>r "ry:%s/^Rr/
So I visually select the thing I want to replace, and hit ,r, type the replacement and hit return. If I want to paste the replacement, I yank it before selecting the text to replace, and then use <C-r>" to paste it as the replacement before hitting return.
Note: to insert ^R in your .vimrc, you actually type <C-v><C-r>.

How to paste yanked text into the Vim command line

I'd like to paste yanked text into Vim's command line. Is it possible?
Yes. Hit Ctrl-R then ". If you have literal control characters in what you have yanked, use Ctrl-R, Ctrl-O, ".
Here is an explanation of what you can do with registers. What you can do with registers is extraordinary, and once you know how to use them you cannot live without them.
Registers are basically storage locations for strings. Vim has many registers that work in different ways:
0 (yank register: when you use y in normal mode, without specifying a register, yanked text goes there and also to the default register),
1 to 9 (shifting delete registers, when you use commands such as c or d, what has been deleted goes to register 1, what was in register 1 goes to register 2, etc.),
" (default register, also known as unnamed register. This is where the " comes in Ctrl-R, "),
a to z for your own use (capitalized A to Z are for appending to corresponding registers).
_ (acts like /dev/null (Unix) or NUL (Windows), you can write to it but it's discarded and when you read from it, it is always empty),
- (small delete register),
/ (search pattern register, updated when you look for text with /, ?, * or # for instance; you can also write to it to dynamically change the search pattern),
: (stores last VimL typed command via Q or :, readonly),
+ and * (system clipboard registers, you can write to them to set the clipboard and read the clipboard contents from them)
See :help registers for the full reference.
You can, at any moment, use :registers to display the contents of all registers. Synonyms and shorthands for this command are :display, :reg and :di.
In Insert or Command-line mode, Ctrl-R plus a register name, inserts the contents of this register. If you want to insert them literally (no auto-indenting, no conversion of control characters like 0x08 to backspace, etc), you can use Ctrl-R, Ctrl-O, register name.
See :help i_CTRL-R and following paragraphs for more reference.
But you can also do the following (and I probably forgot many uses for registers).
In normal mode, hit ":p. The last command you used in vim is pasted into your buffer.
Let's decompose: " is a Normal mode command that lets you select what register is to be used during the next yank, delete or paste operation. So ": selects the colon register (storing last command). Then p is a command you already know, it pastes the contents of the register.
cf. :help ", :help quote_:
You're editing a VimL file (for instance your .vimrc) and would like to execute a couple of consecutive lines right now: yj:#"Enter.
Here, yj yanks current and next line (this is because j is a linewise motion but this is out of scope of this answer) into the default register (also known as the unnamed register). Then the :# Ex command plays Ex commands stored in the register given as argument, and " is how you refer to the unnamed register. Also see the top of this answer, which is related.
Do not confuse " used here (which is a register name) with the " from the previous example, which was a Normal-mode command.
cf. :help :# and :help quote_quote
Insert the last search pattern into your file in Insert mode, or into the command line, with Ctrl-R, /.
cf. :help quote_/, help i_CTRL-R
Corollary: Keep your search pattern but add an alternative: / Ctrl-R, / \|alternative.
You've selected two words in the middle of a line in visual mode, yanked them with y, they are in the unnamed register. Now you want to open a new line just below where you are, with those two words: :pu. This is shorthand for :put ". The :put command, like many Ex commands, works only linewise.
cf. :help :put
You could also have done: :call setreg('"', #", 'V') then p. The setreg function sets the register of which the name is given as first argument (as a string), initializes it with the contents of the second argument (and you can use registers as variables with the name #x where x is the register name in VimL), and turns it into the mode specified in the third argument, V for linewise, nothing for characterwise and literal ^V for blockwise.
cf. :help setreg(). The reverse functions are getreg() and getregtype().
If you have recorded a macro with qa...q, then :echo #a will tell you what you have typed, and #a will replay the macro (probably you knew that one, very useful in order to avoid repetitive tasks)
cf. :help q, help #
Corollary from the previous example: If you have 8go in the clipboard, then #+ will play the clipboard contents as a macro, and thus go to the 8th byte of your file. Actually this will work with almost every register. If your last inserted string was dd in Insert mode, then #. will (because the . register contains the last inserted string) delete a line. (Vim documentation is wrong in this regard, since it states that the registers #, %, : and . will only work with p, P, :put and Ctrl-R).
cf. :help #
Don't confuse :# (command that plays Vim commands from a register) and # (normal-mode command that plays normal-mode commands from a register).
Notable exception is #:. The command register does not contain the initial colon neither does it contain the final carriage return. However in Normal mode, #: will do what you expect, interpreting the register as an Ex command, not trying to play it in Normal mode. So if your last command was :e, the register contains e but #: will reload the file, not go to end of word.
cf. :help #:
Show what you will be doing in Normal mode before running it: #='dd' Enter. As soon as you hit the = key, Vim switches to expression evaluation: as you enter an expression and hit Enter, Vim computes it, and the result acts as a register content. Of course the register = is read-only, and one-shot. Each time you start using it, you will have to enter a new expression.
cf. :help quote_=
Corollary: If you are editing a command, and you realize that you should need to insert into your command line some line from your current buffer: don't press Esc! Use Ctrl-R =getline(58) Enter. After that you will be back to command line editing, but it has inserted the contents of the 58th line.
Define a search pattern manually: :let #/ = 'foo'
cf. :help :let
Note that doing that, you needn't to escape / in the pattern. However you need to double all single quotes of course.
Copy all lines beginning with foo, and afterwards all lines containing bar to clipboard, chain these commands: qaq (resets the a register storing an empty macro inside it), :g/^foo/y A, :g/bar/y A, :let #+ = #a.
Using a capital register name makes the register work in append mode
Better, if Q has not been remapped by mswin.vim, start Ex mode with Q, chain those “colon commands” which are actually better called “Ex commands”, and go back to Normal mode by typing visual.
cf. :help :g, :help :y, :help Q
Double-space your file: :g/^/put _. This puts the contents of the black hole register (empty when reading, but writable, behaving like /dev/null) linewise, after each line (because every line has a beginning!).
Add a line containing foo before each line: :g/^/-put ='foo'. This is a clever use of the expression register. Here, - is a synonym for .-1 (cf. :help :range). Since :put puts the text after the line, you have to explicitly tell it to act on the previous one.
Copy the entire buffer to the system clipboard: :%y+.
cf. :help :range (for the % part) and :help :y.
If you have misrecorded a macro, you can type :let #a=' Ctrl-R =replace(#a,"'","''",'g') Enter ' and edit it. This will modify the contents of the macro stored in register a, and it's shown here how you can use the expression register to do that. Another, simpler, way of modifying a macro is to paste it in a buffer ("ap), edit it, and put it again into the register, by selecting it and "ay.
If you did dddd, you might do uu in order to undo. With p you could get the last deleted line. But actually you can also recover up to 9 deletes with the registers #1 through #9.
Even better, if you do "1P, then . in Normal mode will play "2P, and so on.
cf. :help . and :help quote_number
If you want to insert the current date in Insert mode: Ctrl-R=strftime('%y%m%d')Enter.
cf. :help strftime()
Once again, what can be confusing:
:# is a command-line command that interprets the contents of a register as vimscript and sources it
# in normal mode command that interprets the contents of a register as normal-mode keystrokes (except when you use : register, that contains last played command without the initial colon: in this case it replays the command as if you also re-typed the colon and the final return key).
" in normal mode command that helps you select a register for yank, paste, delete, correct, etc.
" is also a valid register name (the default, or unnamed, register) and therefore can be passed as an arguments for commands that expect register names
For pasting something that is the system clipboard you can just use SHIFT - INS.
It works in Windows, but I am guessing it works well in Linux too.
"I'd like to paste yanked text into Vim command line."
While the top voted answer is very complete, I prefer editing the command history.
In normal mode, type: q:. This will give you a list of recent commands, editable and searchable with normal vim commands. You'll start on a blank command line at the bottom.
For the exact thing that the article asks, pasting a yanked line (or yanked anything) into a command line, yank your text and then: q:p (get into command history edit mode, and then (p)ut your yanked text into a new command line. Edit at will, enter to execute.
To get out of command history mode, it's the opposite. In normal mode in command history, type: :q + enter
For pasting something from the system clipboard into the Vim command line ("command mode"), use Ctrl+R followed by +. For me, at least on Ubuntu, Shift+Ins is not working.
PS: I am not sure why Ctrl+R followed by *, which is theoretically the same as Ctrl+R followed by + doesn't seem to work always. I searched and discovered the + version and it seems to work always, at least on my box.
It's worth noting also that the yank registers are the same as the macro buffers. In other words, you can simply write out your whole command in your document (including your pasted snippet), then "by to yank it to the b register, and then run it with #b.
For context, this information comes from out-of-the-box, no plugins, no .vimrc Vim 7.4 behavior in Linux Mint with the default options.
You can always select text with the mouse (or using V or v and placing the selection in the "* register), and paste it into the command line with Shift + Ctrl + v.
Typing Ctrl + r in the command line will cause a prompt for a register name. so typing :CTRL-r* will place the content register * into the command line. It will paste any register, not just "*. See :help c_CTRL-R.
Furthermore, the middle mouse button will paste into the command line.
See :help->quote-plus for a description of the how X Window deals with selection. Even in a plain, out-of-the-box Vim (again, in Vim 7.4 in Linux Mint, anyway), any selection made with the left mouse button can be pasted in the command line with the middle mouse button.
In addition, the middle mouse button will also paste text selected in Vim into many other X Window applications, even GUI ones (for example, Firefox and Thunderbird) and pasting text into the command line is also possible where the text was selected from other apps.
See :help->x11-selection for addl information.
tl;dr
Try the :CTRL-r approach first, and then use Shift + Ctrl + v or the middle mouse button if you need something else.
It is conceded that it can be confusing.
I was having a similar problem. I wanted the selected text to end up in a command, but not rely on pasting it in. Here's the command I was trying to write a mapping for:
:call VimuxRunCommand("python")
The docs for this plugin only show using string literals. The following will break if you try to select text that contains doublequotes:
vnoremap y:call VimuxRunCommand("<c-r>"")<cr>
To get around this, you just reference the contents of the macro using # :
vnoremap y:call VimuxRunCommand(#")<cr>
Passes the contents of the unnamed register in and works with my double quote and multiline edgecases.
OS X
If you are using Vim in Mac OS X, unfortunately it comes with older version, and not complied with clipboard options. Luckily, Homebrew can easily solve this problem.
Install Vim:
brew install vim --with-lua --with-override-system-vi
Install the GUI version of Vim:
brew install macvim --with-lua --with-override-system-vi
Restart the terminal for it to take effect.
Append the following line to ~/.vimrc
set clipboard=unnamed
Now you can copy the line in Vim with yy and paste it system-wide.
"[a-z]y: Copy text to the [a-z] register
Use :! to go to the edit command
Ctrl + R: Follow the register identity to paste what you copy.
It used to CentOS 7.
If you have two values yanked into two different registers (for example register a and register b) then you can simply set a variable c and do the operation on it.
For example, :set c = str2float(#a) + str2float(#b) and then you can paste the content of c anywhere.
For example whilst in INSERT mode, CTRL + R then type = to enter into the expression register and just type c after equal sign and hit ENTER. Done you should now have the total of a and b registers.
All these can be recorded in a macro and repeated over!
The str2float function is used if you are working with floats, if you don't, you will get integers instead.
I am not sure if this is idiomatic but it worked for my case where I needed to add 2 numbers in a row and repeat it for 500 more lines.
I like to use Control-v to paste from the system clipboard, so I use:
cnoremap <C-v> <C-r>+

When is Visual mode used in Vim?

I'm relatively new to the world of Vim. I've been learning my way around it but have yet to find a practical purpose to enter visual mode.
What are some scenarios when visual mode is especially useful?
Are there actions that can only be performed from within visual mode?
I use visual mode when I want to highlight a section of text. I start by typing v in standard mode, which then enables the visual mode. Then I use the arrow keys to move the cursor. This causes the text between my starting point and the current cursor location to be highlighted. Once you select a section of text like this, entering a command (e.g. search/replace) in command mode (by typing :) will only affect the selected area.
Another useful visual command is shift+v (visual line). This does the same as above, but it selects entire lines at a time instead of individual characters.
When you want to comment a block of text.
In command mode :
Shift + v
,ctrl +v,
j or k,
I , #(comment
character) and then Esc
Vim inserts the comment character to
the start of the block..
is when I am using Gvim, I find it much easier to copy data
to the clipboard through visual mode.
In command mode :
Shift + v
, j or k ,
" , +
,y
Here + is the clipboard
register
This to me is much more legible that using markers
is for manual indenting
Shift + v,
Shift + > for
moving to the right.
Shift + < for
moving to the left. .
repeats
this is fun :-)
One of the nice things about visual mode is that, because of Vim's focus on modality, you can perform most of the commands that you are used to (such as search/replace with :s, d to delete text, or r to replace text) while also seeing exactly what will be affected -- this allows you to determine the exact scope of whatever you are doing.
Furthermore, as someone else mentioned, you can easily insert a prefix (like a comment character or, say, & for alignment or \item in LaTeX) by selecting the first character of each line in visual block mode (ctrl+v), pressing I to insert before the first character, typing in whatever you want to insert, and then Escing back to normal mode.
The last kind of visual mode is visual line (Shift+v), which allows you to quickly select a number of lines. From there, you can change their indentation using > or < (prefix this with a number to indent by that many tabs), use d or y to delete or copy those lines, use zf to create a new fold from those lines, or use any other selection-based command.
Finally, there are a lot of other cool things you can do with visual mode, including gv to reselect your last visual[line/block] mode selection, gU to convert a visual selection to uppercase or gu for lowercase, and many more.
In addition to the other (great) answers, it's an easy way to define scope for an action. For example, to limit a search & replace to a specific method...
Say you have this code:
function foo() {
abc();
while (1) {
def();
abc();
}
}
You can place the cursor on any of the braces or parentheses and press v, %, :, s/abc/xyz/g and your search & replace will have a defined scope in which the action will occur.
Visual mode is useful if you want to apply a command to a section of text that isn't easily described as a primitive movement command. You can select some text in visual mode with a complex sequence of movements and then apply a command to that selection.
I often find myself using visual-block mode (Ctrl + v) more than any of the other visual modes.
You can easily remove indentation, comments, etc. once you are aware of this mode. In my experience, this is often faster than figuring out how to form an equivalent search-and-delete statement.
You can also add indentation (or comments as Cherian stated) by selecting a block of text and pressing I, typing whatever you want to add, and pressing Esc (note: you may need to redraw the screen (e.g. by moving the cursor) to see the effects of this).
I haven't seen the following mentioned, probably because they're subtle.
1 - Less hassle with the unnamed register
Whenever you copy (yank) some text, and then want to d to change some other text, e.g., diw to "delete inner word," Vim will place the deleted text into the unnamed register. Then if you try to paste, it will just paste the deleted text right back unless you do "0p to paste from the 0 register.
But with visual mode, you can just do something like viwp and don't have to mess with registers.
So, for comparison, to copy and replace inside some parens:
yiw -> move somewhere -> vi(p
vs
yiw -> move -> ci(<C-r>0p
yiw -> move -> "_di(p
yiw -> move -> di("0P
Note: this also works for deleting text and pasting it back over a text object. See here.
2 - Jumping to parts of a text object
If you want to jump to the beginning or end of a text object, you can select it in visual mode and press o. For example, va" to select anywhere inside quotes, and then press o to jump to the matching quotes, kind of like % for matching brackets.

Vim / vi Survival Guide

What are the essential vim commands? What does a new-user need to know to keep themselves from getting into trouble? One command per comment, please.
What I find irreplaceable (because it works in vi also, unlike vim's visual mode) are marks. You can mark various spots with m (lower case) and then a letter of your choice (eg x). Then you go elsewhere, and can go back with ``x(backquote letter) to the exact spot, or with'x` (apostrophe letter) to go to the line.
These movements can be used as arguments to commands (yank, delete, etc). For example, you want to delete 10 lines; instead of counting and then moving to the topmost line and entering 10dd, you go to either the start or the end of the block, press mm (mark m), then go to the other end of the block, and press d'm (delete apostrophe m). If you use backquote instead of apostrophe in this example, then the deletion will work character-wise, not line-wise. Try marking in the middle of the line with "mark m", moving to the middle of another line, then entering "d backquote m" and you will see what I mean.
I was very happy the day I learned about using * or # to search, down or up respectively, for the word under the cursor. Make sure to :set incsearch and :set hlsearch first.
I like this QRC!
http://www.fsckin.com/wp-content/uploads/2007/10/vi-vim_cheat_sheet.gif
When you have some repetitive action to take Macros are usually faster than regex.
Just type
q[0-9a-z] in normal mode
Many people use
qq
because it's fast.
Press
q in normal mode
again to stop recording.
Then just type
#[0-9a-z] in normal mode
to repeat what you just recorded.
#q
for the example like above.
Edited to add: you can also repeat the macro. Let's say you programed a macro to jump to the head of a line, insert a tab, and then jump down one line. You then test your macro by typing "#q" to run it once. Then you can repeat the action nine more times by typing "9#q".
:q -> quit
:w -> save
:q! -> quit and don't save
:x -> save and quit
:[number] -> go to line number
G -> go to end of file
dd -> delete line
p -> "put" line
yy -> "copy" line
:s/[searchfor] -> search
I guess those are the basic one to start from
Use the 'J' (J for Join; upper-case) command to delete the newline at the end of a line. You'll find it tricky otherwise.
This recent Vim tutorial from IBM is pretty good
First of all you need to know how to close vi:
ctrl-c : q!
Rest can be found from vimtutor. Launch vimtutor by typing vimtutor at your command line
Although this is a matter of personal preference I've found that one of the essential things to do is to remap Esc to something else.
I find it very uncomfortable to reach for the Esc key to exit insert mode, but the beautiful thing about Vim is that allows key mappings.
I'm currently using the following mapping using Control + S:
inoremap <C-s> <Esc>:w<CR>
This has the advantage of being a key mapping I have already committed to memory and has the added value of saving my work every time I go to normal mode. Yeah, I know it is crazy but I would be hitting the save command that frequently anyway. It's like a bad habit, you know.
" ~/.vimrc
" Turn on line numbering
set nu
" Turn on syntax highlighting
syntax on
" Set 4 space expanding tabs
set tabstop=4
set shiftwidth=4
set softtabstop=4
set expandtab
"turn off line wrapping
set nowrap
" Map CTRL-N to create a new tab
:map <C-n> <ESC>:tabnew<RETURN>
" Map Tab and CTRL-Tab to move between tabs
:map <Tab> <ESC>:tabn<RETURN>
:map <C-Tab> <ESC>:tabp<RETURN>
If you're using vim, the 'u' command (in command mode) will Undo the last command you typed. You can use this command repeatedly to undo mistakes you may have made before saving the file.
See http://www.rayninfo.co.uk/vimtips.html for a great collection of Vim tips, from the basic can't-live-without to very sophisticated stuff that you might never have thought of trying.
Lots of great commands are listed at the Vim Tips Wiki.
It's also good to run the vimtutor when learning these commands
alias vi nedit :)
all humor aside..
for vi WHEN NOT using nedit..
i (switch to insert mode)
a (append = move to end of line and switch to insert mode)
esc (exit insert mode)
dd delete a line
x delete a character
:wq (save and quit)
/ start a search
n find Next
? search backwards..
yy (yank) copy a line to the buffer
pp (paste) paste it here
r (replace a character)
<N> <command> this is a neat - but aggravating feature that lets you type digits and then a command so
5dd will delete 5 lines
but at this point you might as well
- man vi and refresh your memory
While there are LOTS more, I switched from Vi to nedit several years ago, which I find has more features I can use on a regular basis more easily. Tabbed editing, incremental search bar, column select, copy and paste. sort selected lines, search and destroy within selection, whole doc or all open docs..
tear-off drop down menus..
and it supports syntax highlighting for all the languages I use.. (with pattern files I've used a long time over the years. VIM many now be equivalent, but It has to introduce a feature that Nedit doesn't and an easy way to migrate my pattern files before I switch again.
I like the Vim 5.6 Reference Guide, by Bram Moolenaar and Oleg Raisky.
You can directly print it in booklet form, easy to read, I always have it laying around.
It's a tad old, but what are 8 years in Vi's lifespan ?
:set ignorecase smartcase
Makes searching case-insensitive, unless your search includes a capital letter. Not the most indispensable perhaps, but I find myself setting this option any time I'm editing in a new place. It's in any vimrc file I own.
:%!xxd
View the contents of a buffer in hexadecimal. To revert:
:%!xxd -r
My biggest tip: ctrl+q saves the day when you accidentally hit ctrl+s to save the file you are working on
I have this in my vimrc
set number
set relativenumber
This gives me a line numbering system which makes j, k keys really productive.
I use vi very lightly, and I only use the following commands:
a - switch to insert mode (after the cursor)
esc - return to command mode
:wq - save and quit
:q - quit (no save, only without modification)
:q! - force quit (no save, also with modification)
x - delete one character (in command mode)
dd - delete the whole line (in command mode)
I know there are many many more, but those are enough to get you by.
One of my favourite commands is %G which takes to directly to the end of a file. Especially useful in log-files.
How to switch between modes (i to enter insert mode (one of many ways), esc to exit insert mode, colon for command mode) and how to save and exit. (:wq)
Another useful command is to search something: /
e.g. /Mon will search (and in case of vim highlight) any occurences of Mon in your file.
As a couple of other people have already mentioned, vimtutor is the way to go. It will teach you everything you need to know in vim. The one piece of general advice I would give you is to stay out of insert mode as much as possible. There is enormous power in the other modes, it just takes a little bit of practice to get used to it.
i - insert mode (escape to exit)
dd - delete line
shift-y - 'Yank' (copy) line
p - 'Put' (paste) line(s)
shift-v - Visual mode used to select text (tryin 'yanking' this text and 'putting' it somewhere.
ctrl-w n - create new window (you can open a file or start new file here)
ctrl-w v - split existing window vertically
ctrl-n (in insert mode) - autocomplete (if supported)
:! to run a shell command, usually with standard in as the file or a selection (shift-V)
Useful plugins to look at:
* Buffer Explorer - use \be to view files in the buffer (and select to re-open)
NB vi is not vim! vim is rapidly turning into the emacs of the new century. nvi is probably the closest thing to the original vi. Here's a nice hint: "xp" will exchange two characters (try it).
replace 'foo' with 'bar' everywhere in the file
:%s/foo/bar/gc
The real power is in the searching. Here are the essential commands:
/Steve will find the first instance of "Steve" in the text.
n will find the next "Steve" in the text.
:%s//Stephen/g will replace all those instances of "Steve" you just searched for with "Stephen".
Not to promote myself, but I wrote a blog post on this subject. It focuses on the critical parts of Vim for a beginner.
My favorites:
% find matching bracket/brace
* and # next/previous match
gg top of page
G end of the page
<Ctrl-v> Change to visual mode and select column
<Ctrl-a> increase current number by 1
<Ctrl-x> decrease current number by 1
Running macros

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