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Unix Version 7 - man page for passwd (v7 section 5)

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PASSWD(5)										PASSWD(5)

       passwd - password file

       Passwd contains for each user the following information:

       name (login name, contains no upper case)
       encrypted password
       numerical user ID
       numerical group ID
       GCOS job number, box number, optional GCOS user-id
       initial working directory
       program to use as Shell

       This  is an ASCII file.	Each field within each user's entry is separated from the next by
       a colon.  The GCOS field is used only when communicating with that system,  and	in  other
       installations  can  contain any desired information.  Each user 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, the Shell itself is used.

       This  file resides in directory /etc.  Because of the encrypted passwords, it can and does
       have general read permission and can be used, for example, to map numerical user  ID's  to


       getpwent(3), login(1), crypt(3), passwd(1), group(5)

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