2007-10-07 17:14:51 +05:30
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.\"$Id: shadow.5,v 1.8 2001/01/25 10:43:51 kloczek Exp $
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2007-10-07 17:14:44 +05:30
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.\" Copyright 1989 - 1990, Julianne Frances Haugh
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.TH SHADOW 5
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.SH NAME
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shadow \- encrypted password file
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.SH DESCRIPTION
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.I shadow
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contains the encrypted password information for user's accounts
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and optional the password aging information.
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Included is
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.IP "" .5i
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Login name
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.IP "" .5i
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Encrypted password
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.IP "" .5i
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Days since Jan 1, 1970 that password was last changed
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.IP "" .5i
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Days before password may be changed
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.IP "" .5i
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Days after which password must be changed
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.IP "" .5i
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Days before password is to expire that user is warned
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.IP "" .5i
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Days after password expires that account is disabled
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.IP "" .5i
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Days since Jan 1, 1970 that account is disabled
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.IP "" .5i
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A reserved field
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.PP
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The password field must be filled.
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The encryped password consists of 13 to 24 characters from the
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64 character alphabet
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a thru z, A thru Z, 0 thru 9, \. and /.
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Refer to \fBcrypt\fR(3) for details on how this string is
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interpreted.
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.PP
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The date of the last password change is given as the number
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of days since Jan 1, 1970.
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The password may not be changed again until the proper number
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of days have passed, and must be changed after the maximum
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number of days.
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If the minimum number of days required is greater than the
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maximum number of day allowed, this password may not be
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changed by the user.
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.PP
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An account is considered to be inactive and is disabled if
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the password is not changed within the specified number of
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days after the password expires.
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An account will also be disabled on the specified day
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regardless of other password expiration information.
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.PP
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This information supercedes any password or password age
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information present in \fI/etc/passwd\fR.
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.PP
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This file must not be readable by regular users if password
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security is to be maintained.
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.SH FILES
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/etc/passwd \- user account information
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.br
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/etc/shadow \- encrypted user passwords
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.SH SEE ALSO
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.BR chage (1),
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.BR login (1),
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.BR passwd (1),
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.BR su (1),
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.BR sulogin (8),
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.BR passwd (5),
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.BR pwconv (8),
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.BR pwunconv (8)
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.SH AUTHOR
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Julianne Frances Haugh (jockgrrl@ix.netcom.com)
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