O'Reilly logo

Linux in a Nutshell, Fourth Edition by Aaron Weber, Stephen Figgins, Ellen Siever

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Name

readonly

Synopsis

                  readonly [options] [variable1 
                  variable2...]

Prevent the specified shell variables from being assigned new values. Variables can be accessed (read) but not overwritten.

Options

-a

Treat the following names as array variables.

-f

Treat the following names as functions and set them read-only so that they cannot be changed.

-p

Display all read-only variables (default).

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required