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 6.10 (Berkeley) 03/14/91 7.\" 8.Vx 9.Vx 10.Dd 11.Dt PASSWD 1 12.Os BSD 4 13.Sh NAME 14.Nm passwd 15.Nd modify a user's password 16.Sh SYNOPSIS 17.Nm passwd 18.Op Fl l 19.Op Ar user 20.Sh DESCRIPTION 21.Nm Passwd 22changes the user's Kerberos password. First, the user is prompted for their 23current password. 24If the current password is correctly typed, a new password is 25requested. 26The new password must be entered twice to avoid typing errors. 27.Pp 28The new password should be at least six characters long and not 29purely alphabetic. 30Its total length must be less than _PASSWORD_LEN (currently 128 characters). 31Numbers, upper case letters and meta characters 32are encouraged. 33.Pp 34Once the password has been verified, 35.Nm passwd 36communicates the new password information to 37the Kerberos authenticating host. 38.Tp Fl l 39This option causes the password to be updated only in the local 40password file, and not with the Kerberos database. 41When changing only the local password, 42.Xr pwd_mkdb 8 43is used to update the password databases. 44.Tp 45.Pp 46To change another user's Kerberos password, one must first 47run 48.Xr kinit 1 49followed by 50.Xr passwd 1 . 51The super-user is not required to provide a user's current password 52if only the local password is modified. 53.Sh FILES 54.Dw /etc/master.passwd 55.Di L 56.Dp Pa /etc/master.passwd 57The user database 58.Dp Pa /etc/passwd 59A Version 7 format password file 60.Dp Pa /etc/passwd.XXXXXX 61Temporary copy of the password file 62.Dp 63.Sh SEE ALSO 64.Xr chpass 1 , 65.Xr kerberos 1 , 66.Xr kinit 1 , 67.Xr login 1 , 68.Xr passwd 5 , 69.Xr kpasswdd 8 , 70.Xr pwd_mkdb 8 , 71.Xr vipw 8 72.br 73Robert Morris and Ken Thompson, 74.Em UNIX password security 75.Sh HISTORY 76A 77.Nm passwd 78command appeared in Version 6 AT&T UNIX. 79