| 1 | .TH FSCK 1
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| 2 | .SH NAME
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| 3 | fsck, fsck1 \- perform file system consistency check
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| 4 | .SH SYNOPSIS
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| 5 | \fBfsck\fR [\fB\-aclmrs\fR]\fR [\fIdevice\fR] ...\fR
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| 6 | .br
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| 7 | .de FL
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| 8 | .TP
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| 9 | \\fB\\$1\\fR
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| 10 | \\$2
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| 11 | ..
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| 12 | .de EX
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| 13 | .TP 20
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| 14 | \\fB\\$1\\fR
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| 15 | # \\$2
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| 16 | ..
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| 17 | .SH OPTIONS
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| 18 | .FL "\-a" "Automatically repair inconsistencies"
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| 19 | .FL "\-c" "Check and list only the specified i-nodes
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| 20 | .FL "\-l" "List the files and directories in the filesytem
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| 21 | .FL "\-r" "Prompt user for repairs if inconsistencies are found
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| 22 | .FL "\-s" "List the superblock of the file system"
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| 23 | .SH EXAMPLES
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| 24 | .EX "fsck /dev/c0d0p3" "Check file system on \fI/dev/c0d0p3\fR"
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| 25 | .EX "fsck \-a /dev/at0" "Automatically fix errors on \fI/dev/at0\fR"
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| 26 | .EX "fsck \-l /dev/fd0" "List the contents of \fI/dev/fd0\fR"
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| 27 | .EX "fsck \-c 2 3 /dev/c0d0p2" "Check and list \fI/dev/c0d0p2\fR i-nodes 2 & 3"
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| 28 | .SH DESCRIPTION
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| 29 | .PP
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| 30 | \fIFsck\fR performs consistency checks on the file systems which reside
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| 31 | on the specified devices.
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| 32 | \fIFsck1\fR is an alternate version for use on obsolete V1 file systems.
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| 33 | When either the \fB\-a\fR or \fB\-r\fR flags are given, the file system
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| 34 | will be repaired if errors are found.
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| 35 | Before running \fIfsck\fR on a mounted file system, it must first be unmounted.
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| 36 | Trying to repair a mounted file system is dangerous and should not be
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| 37 | attempted.
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| 38 | .PP
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| 39 | To repair the root file system (which cannot be unmounted), first
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| 40 | type CTRL-F9 at the console to kill any and all processes. Log back in
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| 41 | as \fBroot\fR, type \fIsync\fR to force any buffered changes to disk,
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| 42 | run \fIfsck\fR on the root file system and immediately reboot the
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| 43 | computer by typing \fIreboot\fR.
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| 44 | .PP
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| 45 | It is necessary to kill all processes before repairing the root file system
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| 46 | to prevent them from modifying any disk blocks while \fIfsck\fR is running.
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| 47 | This is only necessary for the root file system, any other file system can
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| 48 | simply be unmounted before it is checked.
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| 49 | .SH "SEE ALSO"
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| 50 | .BR mkfs (1),
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| 51 | .BR mount (1).
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| 52 | .\" disk name refs corrected, i.e., old hd1 now c0d0p0 -- ASW 2005-01-15
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