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NetBSD 6.1.5 - man page for chsh (netbsd section 1)

CHPASS(1)			   BSD General Commands Manual				CHPASS(1)

     chpass, chfn, chsh -- add or change user database information

     chpass [-a list] [-s newshell] [-l] [user]
     chpass [-a list] [-s newshell] [-y] [user]

     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 (``:'') sepa-
	     rated 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 data-

     -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:

	   Login:	    user's login name
	   Password:	    user's encrypted password
	   Uid: 	    user's login
	   Gid: 	    user's login group
	   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.

     The vi(1) editor will be used unless the environment variable EDITOR is set to an alterna-
     tive 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.

     /etc/master.passwd  The user database
     /etc/passwd	 A Version 7 format password file
     /etc/ptmp		 Lock file for the passwd database
     /tmp/pw.XXXXXX	 Temporary copy of the user passwd information
     /etc/shells	 The list of approved shells

     finger(1), login(1), passwd(1), pwhash(1), getusershell(3), passwd(5), passwd.conf(5),
     pwd_mkdb(8), vipw(8)

     Robert Morris and Ken Thompson, UNIX Password Security.

     The chpass command appeared in 4.3BSD-Reno.

     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.

     User information should (and eventually will) be stored elsewhere.

BSD					 October 7, 2006				      BSD

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