readonly — Shell Built-in Function to Protect the Value of the Given Variable from Reassignment
Synopsis
sh
readonly [name...] ksh
** readonly [name[=value]]...
Description
Bourne Shell
The names you specify are marked readonly, and the values of the names cannot be changed by subsequent assignment. If you specify no arguments, a list of all readonly names is printed.
Korn Shell
The given names are marked readonly and cannot be changed by subsequent assignment.
For the readonly command, ksh(1) commands that are preceded by one or two asterisks (*) are treated specially in the following ways.
Variable assignment lists preceding the command remain in effect when the command completes.
I/O redirections are processed after variable assignments. ...
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