Changing case in Vim

Question

Is there a command in Vim that changes the case of the selected text?

Answer 1

Visual select the text, then U for uppercase or u for lowercase. To swap all casing in a visual selection, press ~ (tilde).

Without using a visual selection, gU will make the characters in motion uppercase, or use gu for lowercase.

For more of these, see Section 3 in Vim's change.txt help file.