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Chapter 4 Setting Up User Accounts 71
Defining User IDs
A user ID is a number that uniquely identifies a user. Mac OS X computers use the
user ID to keep track of a users directory and file ownership. When a user creates a
directory or file, the user ID is stored as the creator ID. A user with that user ID has read
and write permissions to the directory or file by default.
The user ID should be a unique string of digits from 500 through 2,147,483,648.
Assigning the same user ID to different users is risky, since two users with the same
user ID have identical directory and file permissions.
The user ID 0 is reserved for the root user. User IDs below 100 are reserved for system
use; users with these user IDs should not be deleted and should not be modified
except to change the password of the root user.
In general, once user IDs have been assigned and users start creating files and
directories throughout a network, you shouldn’t change user IDs. One possible scenario
in which you may need to change a user ID is when merging users created on different
servers into one new server or cluster of servers. The same user ID may have been
associated with a different user on the previous server.
When you create a new user account in any shared directory domain, Workgroup
Manager automatically assigns a user ID; the value assigned is an unused user ID (1025
or greater) in the servers search path. (New users created using the Accounts
Preferences pane on Mac OS X Desktop computers are assigned user IDs starting at
501.)
You can use Workgroup Manager to edit the user ID of an account stored in the LDAP
directory of an Open Directory master or a NetInfo domain. You can also use
Workgroup Manager to review the user ID in any directory domain accessible from the
server youre using.
To change a user ID in Workgroup Manager:
1 In Workgroup Manager, click Accounts.
2 Select the account you want to work with.
To select an account, click the small globe above the accounts list and choose the
directory domain where the user’s account resides, and select the user.
3 To authenticate, click the lock.
4 In the Basic pane, specify a value in the User ID field.
Make sure the value is unique in the search policy (search path) of computers the user
will log in to.
Defining Passwords
For information about defining passwords, see the Open Directory administration
guide.
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