unset - Unset values of variables and functions

unset [ -fv ] [ name ... ]

Description

You can use unset to unset each variable or function specified by name. If no option is specified, name refers to a variable. Variables with the read-only attribute cannot be unset.

Options

-f

name refers to a function.

-v

name refers to a variable.

Operands

Each name is a variable or function.

Exit Status

• 0 when successful.
• >0 when at least one name could not be found. The value is the number of names that are not found.

Related information

• export - Set export attribute for variables
• local - Assign a local variable in a function
• readonly - Set read-only attribute for variables
• set - Set or unset options and positional parameters

1. Unset the variable alpha: unset alpha
2. Unset the function foo: unset -f foo