Often enough you'll need to debug something and would like to see line numbers.
To set just for the session, type:
:set number
To unset, type:
:set nonumber
This command is entered when you are not in insert mode.
To make this a permanent preference, edit your .vimrc file in your home directory.
(If you don't have one, create it, example: touch /home/myuserid/.vimrc )
Add the following on it's own line:
:set number
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