Question

I accidentally press a shorcut key, and I know that vim has done something but I don’t know what.

How can I find out what that shortcut key does?

Answer 1

There are two potential sources for information. First of all, if it’s a built in shortcut, it is normally in the help documentation. For instance, if you do :help CTRL-I, it’ll take you to a help entry about moving around your jump list.

It is possible, however, that you have a custom mapping from one of your .vimrc files or an underdocumented plugin. In that case, try using :map which will list all custom keyboard mappings that are currently active. That will give you three columns:

1. the mode the mapping applies to
2. the keyboard shortcut
3. the command that is run

You can then use :help to further investigate the command that is run.