:r foo.txt
:!sh
:s/bar/BAR/g
gU shift+->
Sometimes when I was using vim or vi, I usually forgot some commands and got struck with pasting auto-index, replacing the wrong text because of case-sensitive and blah blah blah.
I’m always searching for the commands but suddenly forget them as soon as the file is saved. LOL
So I decided to create vim’s memo for myself :)