vim cheat sheet

To delete all lines containing "word" run the following
:g/word/d

To delete all lines that are empty or that contain only whitespace
:g/^\s*$/d

To delete all lines that do not contain a pattern, use g!. This command will delete all lines that are not comment lines.
:g!/^\s*"/d

Find the word "DOMAIN\" and replace with blank
:%s/DOMAIN\\//gc

Find ", " and replace with a cariage return \r
:%s/, /\r/gc

Delete the first 4 characters at the start of each line
:%s/^.\{4}//gic

Delete all trailing whitespace (at the end of each line) with:
:%s/\s\+$//

Delete all white space at the start of the line
:%le
 or
:%s/^\s\+

Convert all UPPERCASE letters to lowercase
:%s/[A-Z]/\L&/g

Convert all lowercase letters to UPPERCASE
:%s/[a-z]/\U&/g

To sort alphabetically
:sort