readonly(1)                                                 readonly(1)

  readonly

  NAME

    readonly - set parameter read-only attribute

  SYNOPSIS

    readonly [-p] [parameter[=value]] ...

  DESCRIPTION

    This command is a Korn-shell built-in command.

    The readonly(1) command sets the read-only attribute of the named
    parameters. If values are given, parameters are set to them before setting
    the attribute. Once a parameter is made read-only, it cannot be unset, and
    its value cannot be changed.

    If no parameters are specified, the names of all parameters with the read-
    only attribute are printed one per line, unless the -p option is used, in
    which case readonly commands defining all read-only parameters, including
    their values, are printed.