shadow password file
is an access-restricted ASCII system file
that contains an entry for each user on the system.
The fields within each entry are separated by colons;
each entry is separated from the next by a new-line.
Unlike the /etc/passwd file, /etc/shadow does
not have general read permission.
Here are the fields in /etc/shadow:
The name by which a user identifies himself or herself
when logging in.
A 13-character encrypted password for the user, a ``lock'' string
to indicate the login is not accessible, or no string to show
that there is no password for the login.
The number of days between January 1, 1970, and the date that the
password was last modified.
The minimum number of days required between password changes.
The maximum number of days the password is valid.
The number of days before password expires that the user is warned.
The number of days of inactivity allowed for that user.
An absolute date specifying when the login may no longer be used.
A character identifying a password generator.
The encrypted password consists of 13 characters chosen from a 64-character
0-9, A-Z, a-z).
To update this file, use the passwd, useradd,
usermod, or userdel command.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004