chpass allows editing of the user database information associated with
user or, by default, the current user. The information is formatted and supplied to an editor for changes.
Only the information that the user is allowed to change is displayed.
The options are as follows:
-a
The super-user is allowed to directly supply a user database entry, in the format specified by
passwd(5), as an argument. This argument must be a colon (“:”) separated list of all the user database fields, although they may be empty.
-s
The -s option attempts to change the user's shell to newshell.
-l
This option causes the password to be updated only in the local password file. When changing only the local password,
pwd_mkdb(8) is used to update the password databases.
-y
This forces the YP password database entry to be changed, even if the user has an entry in the local database. The
rpc.yppasswdd(8) daemon should be running on the YP master server.
Possible display items are as follows:
Password:
user's encrypted password
Change:
password change time
Expire:
account expiration time
Class:
user's general classification
Home Directory:
user's home directory
Shell:
user's login shell
Full Name:
user's real name
Location:
user's normal location
Home Phone:
user's home phone
Office Phone:
user's office phone
The
login field is the user name used to access the computer account.
The
password field contains the encrypted form of the user's password.
The
uid field is the number associated with the
login field. Both of these fields should be unique across the system (and often across a group of systems) as they control file access.
While it is possible to have multiple entries with identical login names and/or identical user id's, it is usually a mistake to do so. Routines that manipulate these files will often return only one of the multiple entries, and that one by random selection.
The
group field is the group that the user will be placed in at login. Since
BSD supports multiple groups (see
groups(1)) this field currently has little special meaning. This field may be filled in with either a number or a group name (see
group(5)).
The
change field is the date by which the password must be changed.
The
expire field is the date on which the account expires.
Both the
change and
expire fields should be entered in the form “month day year” where
month is the month name (the first three characters are sufficient),
day is the day of the month, and
year is the year.
The
class field is a key for a user's login class. Login classes are defined in
login.conf(5), which is a
termcap(5) style database of user attributes, accounting, resource and environment settings.
The user's
home directory is the full
UNIX path name where the user will be placed at login.
The
shell field is the command interpreter the user prefers. If the
shell field is empty, the Bourne shell,
/bin/sh, is assumed. When altering a login shell, and not the super-user, the user may not change from a non-standard shell or to a non-standard shell. Non-standard is defined as a shell not found in
/etc/shells.
The last four fields are for storing the user's
full name,
office location, and
home and
work telephone numbers.
Once the information has been verified,
chpass uses
pwd_mkdb(8) to update the user database.