Open System Services Shell and Utilities Reference Manual (G06.29+, H06.08+, J06.03+)

Administrator Commands and Files useradd(8)
/etc/login.defs
Default values for login configuration.
EXIT VALUES
The useradd command exits with the following values:
0 success
1 cannot set password
2 invalid command syntax
3 invalid argument to option
4 specified member (name or number) already in use
6 specified group (name or number) does not exist
7 incorrect LOGIN
9 LOGIN already in use
10 alias already in use
11 LOGIN does not exist
12 cannot create group
13 insufficient privilege
14 cannot create home directory
15 Safeguard is not available, invalid option
RELATED INFORMATION
login.defs(5), users(5), newusers(8), userdel(8), usermod(8).
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