NAME
  unalias - remove alias definitions

SYNOPSIS
  unalias alias-name...

DESCRIPTION
  The unalias utility shall remove the definition for each alias name specified.

OPERANDS
  alias-name  The name of an alias to be removed.

OPTIONS
  -a  Remove all alias definitions from the current shell execution
      environment.

EXIT STATUS
  0   Successful completion.
  >0  One of the alias-name operands specified did not represent a valid alias
      definition, or an error occurred.