View Source: shadow(5) - Waikato Linux Users Group

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SHADOW
!!!SHADOW
NAME
DESCRIPTION
FILES
SEE ALSO
AUTHOR
----
!!NAME


shadow - encrypted password file
!!DESCRIPTION


''shadow'' contains the encrypted password information
for user's accounts and optional the password aging
information. Included is


Login name


Encrypted password


Days since Jan 1, 1970 that password was last
changed


Days before password may be changed


Days after which password must be changed


Days before password is to expire that user is
warned


Days after password expires that account is
disabled


Days since Jan 1, 1970 that account is disabled


A reserved field


The password field must be filled. The encryped password
consists of 13 to 24 characters from the 64 character
alphabet a thru z, A thru Z, 0 thru 9, . and /. Refer to
crypt(3) for details on how this string is
interpreted. If the password field contains some string that
is not valid result of crypt(3), for instance ! or *,
the user will not be able to use a unix password to log in,
subject to pam(7).


The date of the last password change is given as the number
of days since Jan 1, 1970. The password may not be changed
again until the proper number of days have passed, and must
be changed after the maximum number of days. If the minimum
number of days required is greater than the maximum number
of day allowed, this password may not be changed by the
user.


An account is considered to be inactive and is disabled if
the password is not changed within the specified number of
days after the password expires. An account will also be
disabled on the specified day regardless of other password
expiration information.


This information supercedes any password or password age
information present in ''/etc/passwd''.


This file must not be readable by regular users if password
security is to be maintained.
!!FILES


/etc/passwd - user account information
/etc/shadow - encrypted user passwords
!!SEE ALSO


chage(1), login(1), passwd(1),
su(1), sulogin(8), passwd(5),
pwconv(8), pwunconv(8)
!!AUTHOR


Julianne Frances Haugh (jfh@austin.ibm.com)
----

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Last edited on Tuesday, June 4, 2002 12:30:41 am by "perry"

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