-.TH PASSWD 1 "18 January 1983"
-.UC 4
-.SH NAME
-passwd \- change login password
-.SH SYNOPSIS
-.B passwd
-[ name ]
-.SH DESCRIPTION
-This command changes (or installs) a password
-associated with the user
-.IR name
-(your own name by default).
-.PP
-The program prompts for the old password and then for the new one.
-The caller must supply both.
-The new password must be typed twice, to forestall mistakes.
-.PP
-New passwords must be at least four characters long if they use
-a sufficiently rich alphabet and at least six characters long
-if monocase.
-These rules are relaxed if you are insistent enough.
-.PP
-Only the owner of the name or the super-user may change a password;
-the owner must prove he knows the old password.
-.SH FILES
-/etc/passwd
-.SH "SEE ALSO"
-login(1), passwd(5), crypt(3)
-.br
-Robert Morris and Ken Thompson,
-.I UNIX password security
-.SH BUGS
-The password file information should be kept in a different data structure
-allowing indexed access;
-.IR dbm (3X)
-would probably be suitable.
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" @(#)passwd.1 8.1 (Berkeley) 6/6/93
+.\"
+.Dd June 6, 1993
+.Dt PASSWD 1
+.Os BSD 4
+.Sh NAME
+.Nm passwd
+.Nd modify a user's password
+.Sh SYNOPSIS
+.Nm passwd
+.Op Fl l
+.Op Ar user
+.Sh DESCRIPTION
+.Nm Passwd
+changes the user's Kerberos 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.
+.Pp
+The new password should be at least six characters long and not
+purely alphabetic.
+Its total length must be less than
+.Dv _PASSWORD_LEN
+(currently 128 characters).
+Numbers, upper case letters and meta characters
+are encouraged.
+.Pp
+Once the password has been verified,
+.Nm passwd
+communicates the new password information to
+the Kerberos authenticating host.
+.Bl -tag -width flag
+.It Fl l
+This option causes the password to be updated only in the local
+password file, and not with the Kerberos database.
+When changing only the local password,
+.Xr pwd_mkdb 8
+is used to update the password databases.
+.El
+.Pp
+To change another user's Kerberos password, one must first
+run
+.Xr kinit 1
+followed by
+.Xr passwd 1 .
+The super-user is not required to provide a user's current password
+if only the local password is modified.
+.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/passwd.XXXXXX
+Temporary copy of the password file
+.El
+.Sh SEE ALSO
+.Xr chpass 1 ,
+.Xr kerberos 1 ,
+.Xr kinit 1 ,
+.Xr login 1 ,
+.Xr passwd 5 ,
+.Xr kpasswdd 8 ,
+.Xr pwd_mkdb 8 ,
+.Xr vipw 8
+.Rs
+.%A Robert Morris
+.%A Ken Thompson
+.%T "UNIX password security"
+.Re
+.Sh HISTORY
+A
+.Nm passwd
+command appeared in
+.At v6 .
projects / unix-history / blobdiff