Alias command comes handy when we are in need to make long and frequently used command string short.

To list the current set of aliases simply type
$ alias

To display the set alias for a specified alias name, type
$ alias alias-shortstring
Example:
$ alias ls

To set an alias you use the format
$ alias shortstring = “linux command string”

For example,
$ alias ls=”ls -1″

After setting alias for “ls” if we want to get the default “ls” command operation then use
$ \ls

To unset the alias command, use
$ unalias ls

To unset all aliases that are set
$ unalias *