shadow/man/grpck.8

.\"$Id: grpck.8,v 1.17 2005/04/12 17:53:21 kloczek Exp $
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.TH GRPCK 8
.SH NAME
grpck \- verify integrity of group files
.SH SYNOPSIS
\fBgrpck\fR [\fB\-r\fR] [\fIgroup\fR \fIshadow\fR]
.SH DESCRIPTION
\fBgrpck\fR verifies the integrity of the system authentication information.
All entries in the \fI/etc/group\fR and \fI/etc/gshadow\fR are checked to
see that the entry has the proper format and valid data in each field. The
user is prompted to delete entries that are improperly formatted or which
have other incorrectable errors.
.PP
Checks are made to verify that each entry has:
.sp
.in +.5i
\- the correct number of fields
.br
\- a unique group name
.br
\- a valid list of members and administrators
.in \-.5i
.sp
.PP
The checks for correct number of fields and unique group 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 group name is
prompted for deletion, but the remaining checks will still be made. All
other errors are warnings and the user is encouraged to run the
\fBgroupmod\fR command to correct the error.
.PP
The commands which operate on the \fI/etc/group\fR file are not able to
alter corrupted or duplicated entries. \fBgrpck\fR should be used in those
circumstances to remove the offending entry.
.SH OPTIONS
By default, \fBgrpck\fR operates on the files \fI/etc/group\fR and
\fI/etc/gshadow\fR. The user may select alternate files with the \fIgroup\fR
and \fIshadow\fR parameters. Additionally, the user may execute the command
in read\-only mode by specifying the \fB\-r\fR flag. This causes all questions
regarding changes to be answered \fBno\fR without user intervention.
\fBgrpck\fR can also sort entries in \fI/etc/group\fR and \fI/etc/gshadow\fR
by GID. To run it in sort mode pass it \fB\-s\fR flag. No checks are
performed then, it just sorts.
.SH FILES
\fI/etc/group\fR	\- group account information
.br
\fI/etc/gshadow\fR	\- encrypted passwords and group administrator information
.br
\fI/etc/passwd\fR	\- user account information
.SH SEE ALSO
.BR group (5),
.BR passwd (5),
.BR shadow (5),
.BR groupmod (8)
.SH EXIT VALUES
.TP 2
The \fBgrpck\fR command exits with the following values:
.br
\fB0\fR	\- success
.br
\fB1\fR	\- syntax Error
.br
\fB2\fR	\- one or more bad group entries
.br
\fB3\fR	\- can't open group files
.br
\fB4\fR	\- can't lock group files
.br
\fB5\fR	\- can't update group files
.SH AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)