Copyright (c) 1996 Christos Zoulas. All rights reserved.
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.Dd June 18, 2001 .Dt FSCK 8 .Os .Sh NAME .Nm fsck .Nd file system consistency check and interactive repair .Sh SYNOPSIS .Nm "" .Op Fl dfnpvy .Op Fl l Ar maxparallel .Op Fl t Ar fstype .Op Fl T Ar fstype:fsoptions .Op special | node ... .Sh DESCRIPTION The .Nm command invokes file system-specific programs to check the special devices listed in the .Xr fstab 5 file or in the command line for consistency.
p It is normally used in the script
a /etc/rc during automatic reboot. If no file systems are specified, and ``preen'' mode is enabled ( .Fl p option) .Nm reads the table
a /etc/fstab to determine which file systems to check, in what order. Only partitions in fstab that are mounted ``rw,'' ``rq'' or ``ro'' and that have non-zero pass number are checked. File systems with pass number 1 (normally just the root file system) are checked one at a time. When pass 1 completes, all remaining file systems are checked, running one process per disk drive. By default, file systems which are already mounted read-write are not checked. The disk drive containing each file system is inferred from the longest prefix of the device name that ends in a digit; the remaining characters are assumed to be the partition designator.
p The options are as follows: l -tag -width indent t Fl d Debugging mode. Just print the commands without executing them. t Fl f Force checking of file systems, even when they are marked clean (for file systems that support this), or when they are mounted read-write. t Fl l Ar maxparallel Limit the number of parallel checks to the number specified in the following argument. By default, the limit is the number of disks, running one process per disk. If a smaller limit is given, the disks are checked round-robin, one file system at a time. t Fl n Causes .Nm to assume no as the answer to all operator questions, except "CONTINUE?". t Fl p Enter preen mode. In preen mode, .Nm will check all file systems listed in
a /etc/fstab according to their pass number, and will make minor repairs without human intervention. Any major problems will cause .Nm to exit with a non-zero .Xr exit 3 code, so as to alert any invoking program or script that human intervention is required. t Fl t Ar fstype Invoke .Nm only for the comma separated list of file system types. If the list starts with .Dq no then invoke .Nm for the file system types that are not specified in the list. t Fl v Print the commands before executing them. t Fl y Causes .Nm to assume yes as the answer to all operator questions. t Fl T Ar fstype: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 l -tag -width /etc/fstab -compact t Pa /etc/fstab file system table .El .Sh SEE ALSO .Xr fstab 5 , .Xr fsck_ffs 8 , .Xr fsck_msdos 8 , .Xr mount 8
Indexes created Sat Oct 25 16:10:12 GMT 2025