Vim tip 7: changing case in Normal mode
You can use the following commands to change the case of characters:
- ~ invert the case of the character under the cursor (i.e. lowercase becomes UPPERCASE and vice versa)
- g~ followed by motion inverts the case of those characters
- for example: g~e, g~$, g~iw, etc
- gu followed by motion changes those characters to lowercase
- for example: gue, gu$, guiw, etc
- gU followed by motion changes those characters to UPPERCASE
- for example: gUe, gU$, gUiw, etc
You can also provide a count prefix to these commands. For example, 3~ will invert the case of the current character and two characters to the right.
See also my Vim Reference Guide and curated list of resources for Vim.