Environment variables
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Document here various environment variables and their uses.
Variables
$EDITOR is used by visudo.
$VISUAL: Same as $EDITOR. The difference between the two is long obsolete. The best policy is to set both to the same value.
Files
See:
Other
https://wiki.archlinux.org/index.php/environment_variables
https://help.ubuntu.com/community/EnvironmentVariables