How to copy text from command-line mode in Vim?

Say, I just ran this command in Vim:

开发者_如何学Python:nmap <CR> <C-]>

And now I want to copy this line and put it into my .vimrc. How can I select and copy the whole line in command-line mode?

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The fastest way is to run the command, switch to the destination buffer (with .vimrc loaded, in this case) and paste the whole command from the : register by typing

":p

in Normal mode.

If the command is further back in time, one can first recall it from history (e.g., by typing the first few letters and pressing the up arrow key ↑), rerun it, and then use the above method.

When these shortcuts are unhandy, one can resort to the general approach of using the command-line window (see :help cmdwin). To open it, either type q: in Normal mode, or press the key combination set by the cedit option (Ctrl+F, by default) in Command-line mode.

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You can type Ctrl-F while in command mode to open up a special window with all previous commands. Then you can scroll to the desired line, hit yy to copy that line, then press Ctrl-C to return to command mode, and then ESC to return to normal mode. From there you can paste.

See :help cmdwin for more information on the command window.