How do you access the last executed command in Vim?
:@:
The : register stores the last command-line command.
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Searching...How do you access the last inserted text in Vim?
<C-r>.
In insert mode, .
What is the difference between register 0 and register 1 in Vim?
"0p vs "1p
Register 0 always contains the last yanked text.
How do you paste from a register with automatic indentation?
"a]p
Use ]p after specifying a register to paste with adjusted indentation.
How do you insert the current filename from a register?
<C-r>%
In insert mode, % inserts the current filename.
How do you retrieve a register's contents in Vimscript?
:echo getreg('a')
Use getreg('a') to get the contents of register a as a string.
How do you paste from a specific register while in insert mode?
<C-r>a
In insert mode, press followed by the register name.
How do you use the expression register to evaluate Vimscript?
<C-r>=expand('%:t')<CR>
In insert mode, = opens the expression register.
How do you use registers to exchange two pieces of text?
"adiw then move, "aP and diw
Delete the first word into register a with "adiw, move to the second word, paste register a before with "aP, then delete the remaining original.
How do you use the expression register to insert a calculation?
<C-r>=42*7<CR>
In insert mode, press = to access the expression register, type a math expression like 42*7, and press Enter to insert the result (294).
How do you change the case of text stored in a register?
:let @a = toupper(@a)
Use Vimscript functions toupper() or tolower() with :let @a = toupper(@a) to convert the case of the entire register contents.
How do you use the alternate file register?
<C-r>#
The # register holds the alternate (previously edited) filename.
How do you delete text without affecting any register?
"_dd
Use the black hole register " before a delete command.
How do you record a macro to wrap a word in a function call?
qaciWmyFunc(<C-r>")<Esc>q
Record a macro that changes the inner word, types the function name with opening paren, pastes the original word from the register, and closes the paren.
How do you use a macro to yank all regex matches into a register?
qaq:g/pattern/normal "Ayy
Clear register a with qaq, then use :g/pattern/normal "Ayy to append all matching lines to register a.
How do you record a macro to swap the current line with the one below?
qaddpq
Record a macro that deletes the current line with dd and pastes it below the next line with p.
How do you use a macro to title-case each word on a line?
qagUlwq
Record a macro that uppercases the first letter of the current word with gUl, then moves to the next word with w.
How do you record a macro to toggle boolean values (true/false)?
qa/true\|false\ncgn<C-r>=@"=='true'?'false':'true'\n<Esc>q
Record a macro using cgn with an expression register to toggle between true and false.
How do you save a macro permanently in your vimrc?
:let @a='...' in vimrc
Add let @a='macro-keystrokes' to your vimrc file to have the macro available in every Vim session.
How do you use a macro to sort paragraphs alphabetically?
qavip:sort\n}jq
Record a macro that visually selects the inner paragraph, sorts its lines, then moves to the next paragraph.