3    Shell Command Language

3.5    Parameters and Variables

3.5.3    Variables

PS1	[124:300] For users who have specific additional implementation-defined privileges (see [POSIX.2] 2.2.2.8), the default may be another, implementation defined, value.

The operating system provides a default value for PS1 of # for users with super-user privileges.

3.7    Redirection

[131:563] It is implementation defined what the largest value can be; however, all implementations shall support at least 0 through 9 for use by the application.

The largest file descriptor supported by the operating system is 16 (POSIX_OPEN_MAX).

3.14    Special Built-In Utilities

3.14.11    set - Set/unset options and positional parameters

-b	[157:1615] This option shall be supported if the system supports the User Portability Utilities Option.

The operating system supports the User Portability Utilities Option.