/etc/default/useradd

This file may contain the following parameters that provide default values for the useradd(1M) command:

SHELL

full pathname of user's login shell

HOMEDIR

base directory in which to create user's home directory

SKELDIR

directory that contains skeleton information (such as a .profile file) to be copied to the user's home directory

GROUPID

default group ID

INACT

the maximum number of days allowed between uses of a login name

EXPIRE

the date on which a login name can no longer be used

FORCED_PASS

a password generator, defined for the user

AUDIT_MASK

default user audit mask; valid only if the Auditing Utilities are installed and running on the system