LinuxGuruz
  • Last 5 Forum Topics
    Replies
    Views
    Last post


The Web Only This Site
  • BOOKMARK

  • ADD TO FAVORITES

  • REFERENCES


  • MARC

    Mailing list ARChives
    - Search by -
     Subjects
     Authors
     Bodies





    FOLDOC

    Computing Dictionary




  • Text Link Ads






  • LINUX man pages
  • Linux Man Page Viewer


    The following form allows you to view linux man pages.

    Command:

    passwd

    
    
    
    

    SYNOPSIS

           passwd  [-k]  [-l]  [-u  [-f]]  [-d] [-e] [-n mindays] [-x maxdays] [-w
           warndays] [-i inactivedays] [-S] [--stdin] [username]
    
    
    

    DESCRIPTION

           The passwd utility is used to update user's authentication token(s).
    
           This task is achieved through calls to the Linux-PAM and  Libuser  API.
           Essentially, it initializes itself as a "passwd" service with Linux-PAM
           and utilizes configured  password  modules  to  authenticate  and  then
           update a user's password.
    
           A simple entry in the global Linux-PAM configuration file for this ser-
           vice would be:
    
            #
            # passwd service entry that does strength checking of
            # a proposed password before updating it.
            #
            passwd password requisite pam_cracklib.so retry=3
            passwd password required pam_unix.so use_authtok
            #
    
           Note, other module types are not required for this application to func-
           tion correctly.
    
    
    

    OPTIONS

           -k     The  option  -k, is used to indicate that the update should only
                  be for  expired  authentication  tokens  (passwords);  the  user
                  wishes to keep their non-expired tokens as before.
    
           -l     This  option  is  used  to  lock the specified account and it is
                  available to root only. The locking is  performed  by  rendering
                  the  encrypted password into an invalid string (by prefixing the
                  encrypted string with an !).
    
           --stdin
                  This option is used to indicate that passwd should read the  new
                  password from standard input, which can be a pipe.
    
           -u     This  is  the  reverse  of  the  -l  option - it will unlock the
                  account password by removing the ! prefix. This option is avail-
                  able  to  root  only.  By default passwd will refuse to create a
    
           -n     This  will  set  the  minimum password lifetime, in days, if the
                  user's account supports password lifetimes.  Available  to  root
                  only.
    
           -x     This  will  set  the  maximum password lifetime, in days, if the
                  user's account supports password lifetimes.  Available  to  root
                  only.
    
           -w     This  will set the number of days in advance the user will begin
                  receiving warnings that her password will expire, if the  user's
                  account supports password lifetimes.  Available to root only.
    
           -i     This  will  set  the  number  of  days which will pass before an
                  expired password for this account will be taken to mean that the
                  account  is  inactive  and  should  be  disabled,  if the user's
                  account supports password lifetimes.  Available to root only.
    
           -S     This will output a short information about  the  status  of  the
                  password for a given account. Available to root user only.
    
    
    

    Remember the following two principles

           Protect your password.
                  Don't  write  down  your password - memorize it.  In particular,
                  don't write it down and leave it anywhere, and don't place it in
                  an  unencrypted  file!  Use unrelated passwords for systems con-
                  trolled by different organizations.  Don't give  or  share  your
                  password,  in particular to someone claiming to be from computer
                  support or a vendor.  Don't let  anyone  watch  you  enter  your
                  password.   Don't  enter  your  password to a computer you don't
                  trust or if things Use the  password  for  a  limited  time  and
                  change it periodically.
    
           Choose a hard-to-guess password.
                  passwd through the calls to the pam_cracklib PAM module will try
                  to prevent you from choosing a really bad password, but it isn't
                  foolproof;  create  your  password  wisely.  Don't use something
                  you'd find in a dictionary (in any language or  jargon).   Don't
                  use a name (including that of a spouse, parent, child, pet, fan-
                  tasy character, famous person, and location) or any variation of
                  your personal or account name.  Don't use accessible information
                  about you (such as your phone number, license plate,  or  social
                  security number) or your environment.  Don't use a birthday or a
                  simple pattern (such as backwards, followed by a digit, or  pre-
                  ceded by a digit. Instead, use a mixture of upper and lower case
                  letters, as well as digits or punctuation.  When choosing a  new
                  password, make sure it's unrelated to any previous password. Use
    
           are written to the standard error stream.
    
    
    

    CONFORMING TO

           Linux-PAM (Pluggable Authentication modules for Linux).
    
    
    

    FILES

           /etc/pam.d/passwd - the Linux-PAM configuration file
    
    
    

    BUGS

           None known.
    
    
    

    SEE ALSO

           pam(8), pam.d(5), libuser.conf(5), and pam_chauthtok(3).
    
           For more complete information on how to configure this application with
           Linux-PAM, see the Linux-PAM System Administrators' Guide.
    
    
    

    AUTHOR

           Cristian Gafton <gafton@redhat.com>
    
    
    

    GNU/Linux Jan 26 2012 PASSWD(1)

    
    
  • MORE RESOURCE


  • Linux

    The Distributions





    Linux

    The Software





    Linux

    The News



  • MARKETING






  • Toll Free

webmaster@linuxguruz.com
Copyright © 1999 - 2016 by LinuxGuruz