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

PASSWD(1)			   BSD General Commands Manual				PASSWD(1)

NAME
     passwd -- modify a user's password

SYNOPSIS
     passwd [user]
     passwd [-d files | -l] [user]
     passwd [-d nis | -y] [user]
     passwd [-d krb5 | -k] [principal]

DESCRIPTION
     passwd changes the user's password.  First, the user is prompted for their current password.
     If the current password is correctly typed, a new password is requested.  The new password
     must be entered twice to avoid typing errors.

     The new password should be at least six characters long and not purely alphabetic.  Its
     total length must be less than _PASSWORD_LEN (currently 128 characters).  Numbers, upper
     case letters and meta characters are encouraged.

     All options may not be available on all systems.

     -d database
	   This option specifies the password database that should be updated.	The following
	   databases are supported:

	   files  This specifies that the password change should be applied to the local password
		  file.  When changing only the local password, passwd uses pwd_mkdb(8) to update
		  the password databases.

	   nis	  This specifies that the password change should be applied to the NIS password
		  database.  The rpc.yppasswdd(8) daemon should be running on the master NIS
		  server.

	   krb5   This specifies that the user's Kerberos 5 password should be changed.  The host
		  must be configured to use Kerberos.  See krb5.conf(5).

     -l    This is the equivalent of -d files.

     -y    This is the equivalent of -d nis.

     -k    This is the equivalent of -d krb5.

     If a password database is not specified, passwd will change the password database as deter-
     mined by the Pluggable Authentication Module (PAM) library.

     The type of cipher used to encrypt the password depends on the configuration in
     passwd.conf(5).  It can be different for local and NIS passwords.

FILES
     /etc/master.passwd  The user database
     /etc/passwd	 A Version 7 format password file
     /etc/passwd.XXXXXX  Temporary copy of the password file

SEE ALSO
     chpass(1), login(1), pwhash(1), passwd(5), passwd.conf(5), pam(8), pwd_mkdb(8), vipw(8)

     Robert Morris and Ken Thompson, UNIX password security.

HISTORY
     A passwd command appeared in Version 6 AT&T UNIX.

BSD					February 25, 2005				      BSD


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