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.\"     @(#)chpass.1	8.2 (Berkeley) 12/30/93
.\"
.Dd December 30, 1993
.Dt CHPASS 1
.Os
.Sh NAME
.Nm chpass
.Nd add or change user database information
.Sh SYNOPSIS
.Nm chpass
.Op Fl a Ar list
.Op Fl s Ar newshell
.Op user
.Sh DESCRIPTION
.Nm Chpass
allows editing of the user database information associated
with
.Ar user
or, by default, the current user.
The information is formatted and supplied to an editor for changes.
.Pp
Only the information that the user is allowed to change is displayed.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl a
The super-user is allowed to directly supply a user database
entry, in the format specified by
.Xr passwd 5 ,
as an argument.
This argument must be a colon (``:'') separated list of all the
user database fields, although they may be empty.
.It Fl s
The
.Fl s
option attempts to change the user's shell to
.Ar newshell .
.El
.Pp
Possible display items are as follows:
.Pp
.Bl -tag -width "Home Directory:" -compact -offset indent
.It Login:
user's login name
.It Password:
user's encrypted password
.It Uid:
user's login
.It Gid:
user's login group
.It Change:
password change time
.It Expire:
account expiration time
.It Class:
user's general classification
.It Home Directory:
user's home directory
.It Shell:
user's login shell
.It Full Name:
user's real name
.It Location:
user's normal location
.It Home Phone:
user's home phone
.It Office Phone:
user's office phone
.El
.Pp
The
.Ar login
field is the user name used to access the computer account.
.Pp
The
.Ar password
field contains the encrypted form of the user's password.
.Pp
The
.Ar uid
field is the number associated with the
.Ar login
field.
Both of these fields should be unique across the system (and often
across a group of systems) as they control file access.
.Pp
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.
.Pp
The
.Ar group
field is the group that the user will be placed in at login.
Since BSD supports multiple groups (see
.Xr groups 1 )
this field currently has little special meaning.
This field may be filled in with either a number or a group name (see
.Xr group 5 ) .
.Pp
The
.Ar change
field is the date by which the password must be changed.
.Pp
The
.Ar expire
field is the date on which the account expires.
.Pp
Both the
.Ar change
and
.Ar expire
fields should be entered in the form ``month day year'' where
.Ar month
is the month name (the first three characters are sufficient),
.Ar day
is the day of the month, and
.Ar year
is the year.
.Pp
The
.Ar class
field is currently unused.  In the near future it will be a key to
a
.Xr termcap 5
style database of user attributes.
.Pp
The user's
.Ar home directory
is the full UNIX path name where the user
will be placed at login.
.Pp
The
.Ar shell
field is the command interpreter the user prefers.
If the
.Ar shell
field is empty, the Bourne shell,
.Pa /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
.Pa /etc/shells .
.Pp
The last four fields are for storing the user's
.Ar full name , office location ,
and
.Ar home
and
.Ar work telephone
numbers.
.Pp
Once the information has been verified,
.Nm chpass
uses
.Xr pwd_mkdb 8
to update the user database.
.Sh ENVIRONMENT
The
.Xr vi 1
editor will be used unless the environment variable EDITOR is set to
an alternate editor.
When the editor terminates, the information is re-read and used to
update the user database itself.
Only the user, or the super-user, may edit the information associated
with the user.
.Sh FILES
.Bl -tag -width /etc/master.passwd -compact
.It Pa /etc/master.passwd
The user database
.It Pa /etc/passwd
A Version 7 format password file
.It Pa /etc/ptmp
Lock file for the passwd database
.It Pa /etc/pw.XXXXXX
Temporary copy of the user passwd information
.It Pa /etc/shells
The list of approved shells
.El
.Sh SEE ALSO
.Xr login 1 ,
.Xr finger 1 ,
.Xr passwd 1 ,
.Xr getusershell 3 ,
.Xr passwd 5 ,
.Xr pwd_mkdb 8 ,
.Xr vipw 8
.Rs
.%A Robert Morris
.%A Ken Thompson
.%T "UNIX Password security"
.Re
.Sh BUGS
This program's interface is poorly suited to cryptographic systems such as
Kerberos, and consequently Kerberos password changing is not a feature of
this program.
.Pp
User information should (and eventually will) be stored elsewhere.
.Sh HISTORY
The
.Nm
command appeared in 
.Bx 4.3 Reno .