The readonly builtin command

Synopsis

readonly [-p] [-a] [-A] [-f] [NAME[=VALUE] ...]

Description

The readonly builtin command is used to mark variables or functions as read-only, which means unchangable. Tis implies that it can't be unset anymore.

Options

Option	Description
`-a`	refer to normal arrays
`-A`	refer to associative arrays
`-f`	refer to functions
`-p`	print all read-only variables or functions, `-a`, `-A` and `-f` can be used to filter. The output is reusable as input

An argument of -- disables further option processing.

Return status

Status	Reason
0	no error
!=0	invalid option
!=0	invalid combination of options
!=0	a given `NAME` is invalid

Examples

Portability considerations

in POSIX®, only the -p option is specified

Discussion