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

PASSWD(5)					 File Formats Manual					    PASSWD(5)

NAME
passwd - password file
DESCRIPTION
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 names.
FILES
/etc/passwd
SEE ALSO
getpwent(3), login(1), crypt(3), passwd(1), group(5) PASSWD(5)


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