1. To change to using another printer for the current login session:
Whenever the user prints a file, the output will be sent to the printer ps2.
2. To change to using another editor for the current login session and inform (export) this value to other programs which use it:
EDITOR=vi export EDITOR
This changes the user's default editor to vi and exports this value to other programs -such as electronic mail- which make use of it.
3. To change to using another pager for viewing files the user adds the following lines to their .profile file.
To make this change take immediate effect enter the command:
This causes the .profile file to be read, setting the variables to their new values.