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    Command:

    passmass

    
    
    

    SYNOPSIS

           passmass [ host1 host2 host3 ...  ]
    
    
    

    INTRODUCTION

           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:
    
                  -user
                      User  whose  password will be changed.  By default, the cur-
                      rent user is used.
    
                  -rlogin
                      Use rlogin to access host.  (default)
    
                  -slogin
                      Use slogin to access host.
    
                  -ssh
                      Use ssh to access host.
    
                  -telnet
                      Use telnet to access host.
    
                  -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).
    
                      ging in.  root's password is changed rather than the user's.
                      This  is useful for hosts which do not allow root to log in.
    
    
    

    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.
    
    
    

    CAVEATS

           Using  the  same password on multiple hosts carries risks.  In particu-
           lar, if the password can be stolen, then all of your  accounts  are  at
           risk.  Thus, you should not use Passmass in situations where your pass-
           word is visible, such as across a network which hackers  are  known  to
           eavesdrop.
    
           On  the  other  hand,  if you have enough accounts with different pass-
           words, you may end up writing them down somewhere - and 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 car-
           ried 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!
    
    
    

    SEE ALSO

           "Exploring Expect: A Tcl-Based Toolkit for Automating Interactive  Pro-
           grams" by Don Libes, O'Reilly and Associates, January 1995.
    
    
    

    AUTHOR

           Don Libes, National Institute of Standards and Technology
    
                                    7 October 1993                     PASSMASS(1)
    
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