1.\" Copyright (c) 1990 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)passwd.1 6.9 (Berkeley) 02/12/91 7.\" 8.Dd 9.Dt PASSWD 1 10.Os BSD 4 11.Sh NAME 12.Nm passwd 13.Nd modify a user's password 14.Sh SYNOPSIS 15.Nm passwd 16.Op Fl l 17.Op Ar user 18.Sh DESCRIPTION 19.Nm Passwd 20changes the user's Kerberos password. First, the user is prompted for their 21current password. 22If the current password is correctly typed, a new password is 23requested. 24The new password must be entered twice to avoid typing errors. 25.Pp 26The new password should be at least six characters long and not 27purely alphabetic. 28Its total length must be less than _PASSWORD_LEN (currently 128 characters). 29Numbers, upper case letters and meta characters 30are encouraged. 31.Pp 32Once the password has been verified, 33.Nm passwd 34communicates the new password information to 35the Kerberos authenticating host. 36.Tp Fl l 37This option causes the password to be updated only in the local 38password file, and not with the Kerberos database. 39When changing only the local password, 40.Xr pwd_mkdb 8 41is used to update the password databases. 42.Tp 43.Pp 44To change another user's Kerberos password, one must first 45run 46.Xr kinit 1 47followed by 48.Xr passwd 1 . 49The super-user is not required to provide a user's current password 50if only the local password is modified. 51.Sh FILES 52.Dw /etc/master.passwd 53.Di L 54.Dp Pa /etc/master.passwd 55The user database 56.Dp Pa /etc/passwd 57A Version 7 format password file 58.Dp Pa /etc/passwd.XXXXXX 59Temporary copy of the password file 60.Dp 61.Sh SEE ALSO 62.Xr chpass 1 , 63.Xr kerberos 1 , 64.Xr kinit 1 , 65.Xr login 1 , 66.Xr passwd 5 , 67.Xr kpasswdd 8 , 68.Xr pwd_mkdb 8 , 69.Xr vipw 8 70.br 71Robert Morris and Ken Thompson, 72.Em UNIX password security 73.Sh HISTORY 74A 75.Nm passwd 76command appeared in Version 6 AT&T UNIX. 77