What is the normal mode vim command that converts false to FALSE as well as 12:48:03 AM to 12:48 simultaneously?

Question

I accidentally performed a command in Normal mode in vim, on a TSV file, where it converted all the false to FALSE, all the true to TRUE, and all the times from 12:48:03 AM format to 12:48.

I believe it was a single command, because I could undo and redo it using 'u' and 'Ctrl-R', but I can't figure out what it was. Does anyone know?

If there is a Command Mode equivalent, I'd also be interested in learning about it, but I am trying to find the normal Mode version.

I have already tried q: and know that it is not a Command Mode command that I accidentally hit.

Answer 1

For changing the case of words you use "gu" and "gU" in normal mode. Both need a scope, so he are some examples:

guu - make whole line lowercase
gUU - make whole line UPPERCASE
guw - make word lowercase
gUw - make word UPPERCASE
guj - make this and next line lowercase
gUk - make this line and previous line UPPERCASE

It also works with curent selections and is fully "." repeatable. More can be found under change in the vim docs.