Korn Shell Programming by Example

unset

Official Description

The variables or functions given by the list of names are unassigned.

Syntax

unset [-fv] name ...

Options

-f names refer to functions.

-v names refer to variables.

Oddities

Read-only variables cannot be unset.

Example

$ readonly                   # Display read-only variables
x=17
$
$ unset x                    # Attempt to unset a read-only variable
/bin/ksh: unset: x: is read only
$
$ y=23                       # Create a normal shell variable
$
$ print $y
23
$
$ unset y                    # Remove it with unset
$
$ print $y

$