Set/Change Default Editor in Unix

If you use csh or tcsh, at the shell prompt, enter:

setenv VISUAL editor
setenv EDITOR editor

If you use sh, ksh, or bash, at the shell prompt, enter:

VISUAL=editor; export VISUAL
EDITOR=editor; export EDITOR

Replace editor with the editor you want to use (e.g., Emacs, Pico, or vi).

Note : To make these changes permanent, you will need to place the appropriate commands described above in your .login or .cshrc files (for csh or tcsh users) or your .profile

copy paste from here

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