passwd man page on Ultrix

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passwd(5)							     passwd(5)

Name
       passwd - password file

Description
       The  file  is an ASCII file that contains the following information for
       each user:

	      Login name
	      Password field
	      User ID
	      Group ID
	      User's real name, office, extension, home phone
	      Initial working directory
	      Program to use as Shell

       Each line in the file represents a user entry.	Each  field  within  a
       user  entry  is separated from the next by a colon.  Each user entry is
       separated from the next by a new line.  If the password field is	 null,
       no password is demanded; if the Shell field is null, then is used.

       This  file  resides  in	directory Because the password, if present, is
       encrypted, the file has general read permission and can	be  used,  for
       example, to map user IDs to names.

       The  ``user's  real name'' can contain an ampersand (&), meaning insert
       the login name.	This information is set by the command and used by the
       command.

       Appropriate  precautions must be taken to lock the file against changes
       if it is to be edited with a text editor.  The command does the	neces‐
       sary locking.

       If the system is running UPGRADE security level and an asterisk appears
       in the password field, or if the system is running ENHANCED level, then
       the  content  of the password field is ignored and the password for the
       account is located in the authentication database. See and the Security
       Guide for Administrators for more information.

       The  files  and	if they exist, contain the hashed version of the file.
       If present, they are used by the	 and  functions	 to  retrieve  entries
       rapidly.	 See for more information.

       The  database can be distributed in a network by a naming service, such
       as Yellow Pages or BIND/Hesiod.	See the Guide to the Yellow Pages Ser‐
       vice or the Guide to the BIND/Hesiod Service for setup information.

Restrictions
       The ``name'' can contain only lowercase ASCII characters a to z and the
       numbers 0 to 9.

Files
See Also
       chfn(1),	 finger(1),  login(1),	 passwd(1),   crypt(3),	  getpwent(3),
       auth(5), group(5), adduser(8), mkpasswd(8), vipw(8)
       Guide to the BIND/Hesiod Service
       Guide to the Yellow Pages Service
       Security Guide for Administrators

								     passwd(5)
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