Frequently used Environment Variables
EDITOR Sets the editor that will be used by other programs
such as the mail program.
PAGER Sets the pager that will be used by programs such as
man to display man pages.
PATH Specifies the directories that the shell is to look
through to find a command. These directories are
searched in the order in which they appear.
PRINTER Sets the printer to which all output is sent by the lpr
SHELL Sets your default shell.
TERM Sets your terminal type for programs such as the
editor and pager.
TZ Sets the time zone you are in.