BASH Alias Command

When entering commands at the command line, its often nice not to enter all of the command.  One of the commands I like to be able to shorten is the dir command, to d.  This may be done by editing the .bashrc file in the home directory and adding a line with the alias command, the syntax of which is:

alias [-p] [name[=value] ...]

      unalias [-a] [name ... ]

so our line of code is

alias d='dir'