
Chapter 4 Setting Up User Accounts 67
• When Mac OS X checks to see whether a user belongs to a group authorized to
access a particular file, it uses short names to find user IDs of group members. For an
example, see “Avoiding Duplicate Short Names” on page 70.
You can have as many as 16 short names associated with a user account. You might
want to use multiple short names as aliases for email accounts, for example. The first
short name is the name used for home directories and group membership lists; don’t
reassign that name after you save the user account.
A short user name can contain as many as 255 Roman characters. However, for clients
using Mac OS X version 10.1.5 and earlier, the first short user name must be 8 characters
or fewer.
Use only these characters for the first short user name (subsequent short names can
contain any Roman character):
• a through z
• A through Z
• 0 through 9
• _ (underscore)
Typically, short names contain eight or fewer characters.
You can use Workgroup Manager to edit the short name of an account stored in the
LDAP directory of an Open Directory master, a NetInfo domain, or other read/write
directory domain. You can also use Workgroup Manager to review the short name in
any directory domain accessible from the server you’re using.
To work with a user’s short name using Workgroup Manager:
1 In Workgroup Manager, click Accounts.
2 Select the account you want to work with.
To select the account, click the small globe above the accounts list and choose the
directory domain where the account resides, then select the user account.
3 To be authenticated, click the lock.
4 In the Short Names field (on the Basic pane), review or edit the short names.
Initially, the value of the short name is “untitled_<some-number>.” If you specify
multiple short names, each should be on its own line.
Avoid assigning the same short name to more than one user. Workgroup Manager
doesn’t let you assign the same short name to different users in any particular domain
or in any domain in the search path (search policy) of the server you’re using, but has
no way of detecting whether duplicates might exist in other domains.
After the user’s account has been saved, you can’t change the first short name, but you
can change others in a list of short names.
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