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.\"$Id: pwck.8,v 1.8 2001/08/14 21:11:18 malekith Exp $
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2007-10-07 17:14:44 +05:30
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.\" Copyright 1992, 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 PWCK 1
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.SH NAME
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pwck \- verify integrity of password files
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.SH SYNOPSIS
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\fBpwck\fR [\fB-sr\fR] [\fIpasswd\fR \fIshadow\fR]
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.SH DESCRIPTION
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\fBpwck\fR verifies the integrity of the system authentication information.
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All entries in the \fI/etc/passwd\fR and \fI/etc/shadow\fR are checked to
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see that the entry has the proper format and valid data in each field.
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The user is prompted to delete entries that are improperly formatted or
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which have other incorrectable errors.
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.P
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Checks are made to verify that each entry has
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.sp
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.in +.5i
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- the correct number of fields
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.br
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- a unique user name
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.br
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- a valid user and group identifier
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.br
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- a valid primary group
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.br
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- a valid home directory
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.br
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- a valid login shell
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.in -.5i
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.sp
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.P
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The checks for correct number of fields and unique user name are fatal.
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If the entry has the wrong number of fields, the user will be prompted to
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delete the entire line.
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If the user does not answer affirmatively, all further checks are bypassed.
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An entry with a duplicated user name is prompted for deletion, but the
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remaining checks will still be made.
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All other errors are warning and the user is encouraged to run the
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\fBusermod\fR command to correct the error.
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.P
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The commands which operate on the \fI/etc/passwd\fR file are not able to
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alter corrupted or duplicated entries.
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\fBpwck\fR should be used in those circumstances to remove the offending
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entry.
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.SH OPTIONS
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By default, \fBpwck\fR operates on the files \fI/etc/passwd\fR and
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\fI/etc/shadow\fR.
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The user may select alternate files with the \fIpasswd\fR and \fIshadow\fR
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parameters.
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Additionally, the user may execute the command in read-only mode by
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specifying the \fB-r\fR flag.
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This causes all questions regarding changes to be answered \fBno\fR
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without user intervention.
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\fBpwck\fR can also sort entries in \fI/etc/passwd\fR and \fI/etc/shadow\fR
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by UID. To run it in sort mode pass it \fB-s\fR flag. No checks are
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performed then, it just sorts.
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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 password information
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.br
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/etc/group \- group information
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.SH SEE ALSO
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.BR usermod (8),
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.BR group (5),
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.BR passwd (5),
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.BR shadow (5)
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.SH DIAGNOSTICS
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The \fBpwck\fR command exits with the following values:
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.IP 0 5
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Success
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.IP 1 5
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Syntax Error
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.IP 2 5
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One or more bad password entries
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.IP 3 5
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Cannot open password files
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.IP 4 5
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Cannot lock password files
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.IP 5 5
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Cannot update password files
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.SH AUTHOR
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Julianne Frances Haugh (jockgrrl@ix.netcom.com)
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