Vim provides operators for changing case: gu for lower case, gU for upper case and g~ for swapping case. For example, gUaw changes the current word to upper ca

Vim provides operators for changing case: gu for lower case, gU for upper case and g~ for swapping case. For example, gUaw changes the current word to upper case. guu changes the whole current line to lower case. In visual mode, you can use just u and U. Bonus useless tip: g? encodes and decodes rot13.