The unalias command is used to remove aliases from the shell.
The syntax is always the same - for example, we can see that this system has an alias causing 'foo' to be interpreted as 'bar':
> alias foo foo='bar' >
If we want to remove it, we simply use unalias:
> unalias foo >
And now we can see that it's gone:
> alias foo >
See also: alias