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To set your default (preferred) editor on your Unix account, you must define the VISUAL and EDITOR environment variables. When you have done this, most Unix programs that use text editors (for example, trn, tin, and nn) will use the editor you have set.
The way to set these environment variables depends upon which Unix shell you use.
If you use csh or tcsh, at the shell prompt, enter:
setenv VISUAL editor setenv EDITOR editor
Replace editor with the editor you want to use (such as Emacs, Pico, or vi).
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 (such as Emacs, Pico, or vi). You may want to include the full path to the editor (for example, /usr/local/bin/emacs, /usr/local/bin/pico, or /bin/vi), rather than simply the name.