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+.TH PASSMASS 1 "7 October 1993"
+.SH NAME
+passmass \- change password on multiple machines
+.SH SYNOPSIS
+.B passmass
+[
+.I host1 host2 host3 ...
+]
+.SH INTRODUCTION
+.B Passmass
+changes a password on multiple machines.  If you have accounts on
+several machines that do not share password databases, Passmass can
+help you keep them all in sync.  This, in turn, will make it easier to
+change them more frequently.
+
+When Passmass runs, it asks you for the old and new passwords.
+(If you are changing root passwords and have equivalencing, the old
+password is not used and may be omitted.)
+
+Passmass understands the "usual" conventions.  Additional arguments
+may be used for tuning.  They affect all hosts which follow until
+another argument overrides it.  For example, if you are known as
+"libes" on host1 and host2, but "don" on host3, you would say:
+
+	passmass host1 host2 -user don host3
+
+Arguments are:
+.RS
+.TP 4
+-user
+User whose password will be changed.  By default, the current user is used.
+
+.TP 4
+-rlogin
+Use rlogin to access host.  (default)
+
+.TP 4
+-slogin
+Use slogin to access host.
+
+.TP 4
+-ssh
+Use ssh to access host.
+
+.TP 4
+-telnet
+Use telnet to access host.
+
+.TP 4
+-program
+
+Next argument is a program to run to set the password.  Default is
+"passwd".  Other common choices are "yppasswd" and "set passwd" (e.g.,
+VMS hosts).  A program name such as "password fred" can be used to
+create entries for new accounts (when run as root).
+
+.TP 4
+-prompt
+Next argument is a prompt suffix pattern.  This allows
+the script to know when the shell is prompting.  The default is
+"# " for root and "% " for non-root accounts.
+
+.TP 4
+-timeout
+Next argument is the number of seconds to wait for responses.
+Default is 30 but some systems can be much slower logging in.
+
+.TP 4
+-su
+
+Next argument is 1 or 0.  If 1, you are additionally prompted for a
+root password which is used to su after logging in.  root's password
+is changed rather than the user's.  This is useful for hosts which
+do not allow root to log in.
+
+.SH HOW TO USE
+The best way to run Passmass is to put the command in a one-line shell
+script or alias.  Whenever you get a new account on a new machine, add
+the appropriate arguments to the command.  Then run it whenever you
+want to change your passwords on all the hosts.
+
+.SH CAVEATS
+
+Using the same password on multiple hosts carries risks.  In
+particular, if the password can be stolen, then all of your accounts
+are at risk.  Thus, you should not use Passmass in situations where
+your password is visible, such as across a network which hackers are
+known to eavesdrop.
+
+On the other hand, if you have enough accounts with different
+passwords, you may end up writing them down somewhere - and
+.I that
+can be a security problem.  Funny story: my college roommate had an
+11"x13" piece of paper on which he had listed accounts and passwords
+all across the Internet.  This was several years worth of careful work
+and he carried it with him everywhere he went.
+Well one day, he forgot to remove it from his jeans, and we found a
+perfectly blank sheet of paper when we took out the wash the following
+day!
+.SH SEE ALSO
+.I
+"Exploring Expect: A Tcl-Based Toolkit for Automating Interactive Programs"
+\fRby Don Libes,
+O'Reilly and Associates, January 1995.
+.SH AUTHOR
+Don Libes, National Institute of Standards and Technology