Customising UNIX environment
Alias: a synonym for command/statement.
garfield@decunx:~[xx]$ alias dir='ls'
garfield@decunx:~[xx]$ dir
c/ doc/ my_file
garfield@decunx:~[xx]$ alias bye='exit'
garfield@decunx:~[xx]$ bye
(log out…)
unalias to remove alias:
garfield@decunx:~[xx]$ unalias bye