.\"	$NetBSD: fsck.8,v 1.19 1999/03/10 00:08:33 erh Exp $
.\"	$FreeBSD$
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.\" Copyright (c) 1996 Christos Zoulas.  All rights reserved.
.\"
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.\"	This product includes software developed by Christos Zoulas.
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.Dd September 23, 1996
.Dt FSCK 8
.Os
.Sh NAME
.Nm fsck
.Nd file system consistency check and interactive repair
.Sh SYNOPSIS
.Nm
.Op Fl dvplfyn
.Op Fl l Ar maxparallel
.Op Fl t Ar fstype 
.Op Fl T Ar fstype : Ns Ar fsoptions 
.Op Ar special | node ...
.Sh DESCRIPTION
The
.Nm
command invokes filesystem-specific programs to check
the special devices listed in the 
.Xr fstab 5
file or in the command line for consistency.
.Pp
It is normally used in the script
.Pa /etc/rc
during automatic reboot.
If no filesystems are specified, and ``preen'' mode is enabled (
.Fl p
option)
.Nm
reads the table
.Pa /etc/fstab
to determine which filesystems to check.
Only partitions in fstab that are mounted ``rw,'' ``rq'' or ``ro''
and that have non-zero pass number are checked.
Filesystems with pass number 1 (normally just the root filesystem)
are always checked one at a time.
.Pp
If not in preen mode, the remaining entries are checked in order of
increasing pass number one at a time.
This is needed when interaction with
.Nm
is required.
.Pp
In preen mode, after pass 1 completes, all remaining filesystems are checked,
in pass number order running one process per disk drive in parallel for each
pass number in increasing order.
.Pp
In other words:  In preen mode all pass 1 partitions are checked sequentially.
Next all pass 2 partitions are checked in parallel, one process per disk drive.
Next all pass 3 partitions are checked in parallel, one process per disk drive.
etc.
.Pp
The disk drive containing each filesystem is inferred from the shortest prefix
of the device name that ends in a digit; the remaining characters are assumed
to be the partition and slice designators.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl d
Debugging mode. Just print the commands without executing them. Available
only if
.Nm
is compiled to support it.
.It Fl f
Force checking of filesystems, even when they are marked clean (for filesystems
that support this).
.It Fl n
Causes
.Nm
to assume no as the answer to all operator questions, except "CONTINUE?".
.It Fl p
Enter preen mode.
.It Fl t Ar fstype
Invoke
.Nm
only for the comma separated list of filesystem types. If the
list starts with
.Dq no
then invoke
.Nm
for the filesystem types that are not specified in the list.
.It Fl v
Print the commands before executing them.
.It Fl y
Causes
.Nm
to assume yes
as the answer to all operator questions.
.It Fl T Ar fstype : Ns Ar fsoptions 
List of comma separated file system specific options for the specified
file system type, in the same format as
.Xr mount 8 .
.El
.Sh FILES
.Bl -tag -width /etc/fstab -compact
.It Pa /etc/fstab
file system table
.El
.Sh SEE ALSO
.Xr mount 8 ,
.Xr fstab 5 ,
.Xr fsck_msdos 8 ,
.Xr fsck_ffs 8