unalias - remove alias definitions
The unalias utility removes the definition for each alias name specified.
The aliases are removed from the current shell execution environment.
The unalias utility supports the XBD specification, Utility Syntax
The following option is supported:
-a Remove all alias definitions from the current shell execution
The following operand is supported:
alias-name The name of an alias to be removed.
The following exit values are returned:
0 Successful completion.
>0 One of the alias-name operands specified did not represent a valid
alias definition, or an error occurred.
Since unalias affects the current shell execution environment, it is
generally provided as a shell regular built-in.
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