aliases
 

how do i exit from vi/etc/aliases and save the aliases file??

When you edit a file using vi, you can save it by doing :wq!

which does: write (meaning save) & quit.

Make sure not to be on insert mode when doing it , otherwise :wq! will be added to your file.

<esc>:wq

vi Editor Cheat Sheet

Graphicsl vi-vim Cheat sheet and tutorial