passwd.5

UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.th PASSWD V 9/10/73
.sh NAME
passwd \*- password file
.sh DESCRIPTION
.it Passwd
contains for each user the
following information:
.s3
.lp +10 5
name (login name, contains no upper case)
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encrypted password
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numerical user ID
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numerical group ID (for now, always 1)
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GCOS job number, box number, optional GCOS user-id
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initial working directory
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program to use as Shell
.s3
.i0
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.
.s3
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.
.sh FILES
/etc/passwd
.sh "SEE ALSO"
login (I), crypt (III), passwd (I), group (V)