'\" t
.\"     Title: pwck
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.75.1 <http://docbook.sf.net/>
.\"      Date: 07/24/2009
.\"    Manual: Polecenia Zarządzania Systemem
.\"    Source: Polecenia Zarządzania Systemem
.\"  Language: Polish
.\"
.TH "PWCK" "8" "07/24/2009" "Polecenia Zarządzania Systemem" "Polecenia Zarządzania Systemem"
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.nh
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.SH "NAZWA"
pwck \- verify integrity of password files
.SH "SK\(/LADNIA"
.HP \w'\fBpwck\fR\ 'u
\fBpwck\fR [\-q] [\-s] [\fIpasswd\fR\ [\ \fIshadow\fR\ ]]
.HP \w'\fBpwck\fR\ 'u
\fBpwck\fR [\-q] [\-r] [\fIpasswd\fR\ [\ \fIshadow\fR\ ]]
.SH "OPIS"
.PP
The
\fBpwck\fR
command verifies the integrity of the users and authentication information\&. It checks that all entries in
/etc/passwd
and
/etc/shadow
have the proper format and contain valid data\&. The user is prompted to delete entries that are improperly formatted or which have other uncorrectable errors\&.
.PP
Checks are made to verify that each entry has:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
the correct number of fields
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
a unique and valid user name
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
a valid user and group identifier
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
a valid primary group
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
a valid home directory
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
a valid login shell
.RE
.PP

shadow
checks are enabled when a second file parameter is specified or when
/etc/shadow
exists on the system\&.
.PP
These checks are the following:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
every passwd entry has a matching shadow entry, and every shadow entry has a matching passwd entry
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
passwords are specified in the shadowed file
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
shadow entries have the correct number of fields
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
shadow entries are unique in shadow
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
the last password changes are not in the future
.RE
.PP
The checks for correct number of fields and unique user name are fatal\&. If the entry has the wrong number of fields, the user will be prompted to delete the entire line\&. If the user does not answer affirmatively, all further checks are bypassed\&. An entry with a duplicated user name is prompted for deletion, but the remaining checks will still be made\&. All other errors are warning and the user is encouraged to run the
\fBusermod\fR
command to correct the error\&.
.PP
The commands which operate on the
/etc/passwd
file are not able to alter corrupted or duplicated entries\&.
\fBpwck\fR
should be used in those circumstances to remove the offending entry\&.
.SH "OPCJE"
.PP
Polecenie
\fBpwck\fR
posiada następujące opcje:
.PP
\fB\-q\fR
.RS 4
Report errors only\&. The warnings which do not require any action from the user won\'t be displayed\&.
.RE
.PP
\fB\-r\fR
.RS 4
Execute the
\fBpwck\fR
command in read\-only mode\&.
.RE
.PP
\fB\-s\fR
.RS 4
Sort entries in
/etc/passwd
and
/etc/shadow
by UID\&.
.RE
.PP
By default,
\fBpwck\fR
operates on the files
/etc/passwd
and
/etc/shadow\&. The user may select alternate files with the
\fIpasswd\fR
and
\fIshadow\fR
parameters\&.
.SH "CONFIGURATION"
.PP
The following configuration variables in
/etc/login\&.defs
change the behavior of this tool:
.PP
\fBPASS_MAX_DAYS\fR (number)
.RS 4
The maximum number of days a password may be used\&. If the password is older than this, a password change will be forced\&. If not specified, \-1 will be assumed (which disables the restriction)\&.
.RE
.PP
\fBPASS_MIN_DAYS\fR (number)
.RS 4
The minimum number of days allowed between password changes\&. Any password changes attempted sooner than this will be rejected\&. If not specified, \-1 will be assumed (which disables the restriction)\&.
.RE
.PP
\fBPASS_WARN_AGE\fR (number)
.RS 4
The number of days warning given before a password expires\&. A zero means warning is given only upon the day of expiration, a negative value means no warning is given\&. If not specified, no warning will be provided\&.
.RE
.SH "PLIKI"
.PP
/etc/group
.RS 4
Informacje o grupach użytkownik\('ow\&.
.RE
.PP
/etc/passwd
.RS 4
Informacja o kontach użytkownik\('ow\&.
.RE
.PP
/etc/shadow
.RS 4
Informacje chronione o użytkownikach\&.
.RE
.SH "KOD ZAKOŃCZENIA"
.PP
Polecenie
\fBpwck\fR
kończy dzia\(/lanie z następującymi wartościami kod\('ow zakończenia:
.PP
\fI0\fR
.RS 4
poprawne zakończenie dzia\(/lania programu
.RE
.PP
\fI1\fR
.RS 4
niepoprawna sk\(/ladnia polecenia
.RE
.PP
\fI2\fR
.RS 4
one or more bad password entries
.RE
.PP
\fI3\fR
.RS 4
can\'t open password files
.RE
.PP
\fI4\fR
.RS 4
can\'t lock password files
.RE
.PP
\fI5\fR
.RS 4
can\'t update password files
.RE
.PP
\fI6\fR
.RS 4
can\'t sort password files
.RE
.SH "ZOBACZ TAKŻE"
.PP

\fBgroup\fR(5),
\fBgrpck\fR(8),
\fBpasswd\fR(5),
\fBshadow\fR(5),
\fBusermod\fR(8)\&.