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Note: this question has two sort of answers on StackOverflow but I thought perhaps a better answer would come from here, and, if not, at least it will be documented where it should be:

• What are the vim commands that start with g?


• Use of g key in vim normal mode

What is the semantic meaning of the letter g in normal mode commands? I have used the heck out of gg, G, and <n>G, but until today, I hadn't ever thought to find out what the semantics of g are in the larger Zen of Vi.

Today I had to lowercase a bunch of constants in my code, and I figured there had to be a better way than character by character (since <n>~ doesn't work, for whatever odd reason that I am unaware of). I found it in g~<n> and g~iw.

This lead me to find the linked answers, but they have less than satisfying explanations, and are on stackoverflow, and not vi.SE, to boot.

So,

What is the vi-semantic meaning of g?

By vi-semantic meaning, I expect people to understand, as in ciw means change in word, so c means change, i, means inner text item, and w means word delineated by space or punctuation excluding _.

P.S., how do I tag this?

g is a little bit of a weird key in vim. A lot of other keys have a specific word to describe their category:

• h, j, k, l, }, {, w, e, etc. are all motions. They tell your cursor to move.




• d, c, y, etc. are all operators. They change the text they operate on in a specific way, and you tell them what text to operate on by giving a motion.

g does not have a name like this. If I had to come up with a name, I would call it a leader. Here's a random example. Let's say you wanted a shortcut that removes every space from the current line. That's not too hard to do:

:s/ //g<cr>

But what do you map it to? How about d for delete spaces? Well... no, d already has a meaning. How about s for space? Well... no, s already has a meaning too. In fact, basically every single key you could think of has a meaning. So what do you map it to? Vim has something called a leader key, which means you pick a key ( by default, although <space> and , are common alternatives), and then use it in all your mappings. For example, you could say:

nnoremap <leader>s :s/ //g<cr>

and map it to <leader>s, whatever you choose leader to be. This is extremely useful, because now you have another 95 two-key sequences you could map to that are guaranteed to not overwrite anything else. You can come up with the shortcuts you find useful and don't have to worry about removing vim's default functionality.

g works in a very similar way. Bram Moolenaar and Bill Joy I'm sure had many useful operations (such as go the beginning/end of the file, or go to [line]) that make sense to create a shortcut for in default vim, but they're not going to be used often enough to justify giving them a one-key shortcut, since these are reserved for the more useful/frequently used things like hjkl, or d and p. There are tons of keyboard shortcuts that all start with g. What do they have in common? Absolutely nothing. They just happen to be useful things to have that aren't worth giving a one-key shortcut for.

So really, gg is a motion just like all the other motions I listed, it just happens to use a two-key sequence. g~ is an operator just like all the other operators I listed, it just happens to use a two-key sequence.

There are several other "leader" like keys in vim. For example, look up in help

• 
  :h z (Commands that start with 'z')


• 
  :h [ (Commands that start with '[')


• 
  :h ctrl-w (Commands that start with <C-w>)