User Identifier (unix) Article Index for
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User Identifier (unix)
APPAREL
BABY
BEAUTY
BOOKS
CAR TOYS
CELL PHONES
DVD'S
ELECTRONICS
GOURMET FOOD
GROCERIES
HEALTH & PERSONAL
HOME & GARDEN
JEWELRY
MUSIC
MUSIC INSTRUMENTS
OFFICE PRODUCTS
SOFTWARE
SPORTING GOODS
TOOLS & HARDWARE
TOYS
VIDEO GAMES
SHOPPING HOME
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  • The Superuser must always have a UID of zero (0).

  • The user "nobody" was traditionally assigned the largest possible UID (as the opposite of the Superuser), 32767. More recently, the user is assigned a UID in the system range (1–100, see below) or between 65530–65535.

  • UIDs from 1 to 100 are otherwise reserved for system use by convention; some manuals recommend that UIDs from 101 to 499 or even 511 be reserved as well.

    • The UID value references users in the ''/etc/passwd'' file. Shadow Password files and Network Information Service also refer to numeric UIDs. The user identifier is a necessary component of Unix File System s and Processes . Certain operating systems might have support for full 16-bit or even 32-bit wide UIDs, making 65536 or 2^32 unique IDs possible.



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