fsck_pcfs(1M) System Administration Commands fsck_pcfs(1M)NAMEfsck_pcfs - file system consistency check and interactive repair
SYNOPSIS
fsck -F pcfs [generic_options] special
fsck -F pcfs [generic_options] [-o specific_options] special
DESCRIPTION
The fsck utility audits and interactively repairs inconsistent condi‐
tions on file systems. special represents the character special device
on which the file system resides, for example /dev/rdiskette. The char‐
acter special device, not the block special device, should be used.
In the case of correcting serious inconsistencies, by default, fsck
asks for confirmation before making a repair and waits for the operator
to respond either yes or no. If the operator does not have write per‐
mission on the file system, fsck defaults to a -n (no corrections)
action. See fsck(1M).
Repairing some file system inconsistencies may result in loss of data.
The amount and severity of data loss may be determined from the diag‐
nostic output.
When executed with the verify option (-o v), fsck_pcfs automatically
scans the entire file system to verify that all of its allocation units
are accessible. If it finds any units inaccessible, it updates the file
allocation table (FAT) appropriately. It also updates any effected
directory entries to reflect the problem. This directory update
includes truncating the file at the point in its allocation chain where
the file data is no longer accessible. Any remaining accessible alloca‐
tion units become orphaned.
Orphaned chains of accessible allocation units are, with the operator's
concurrence, linked back into the file system as files in the root
directory. These files are assigned names of the form fileNNNN.chk,
where the Ns are digits in the integral range from 0 through 9.
After successfully scanning and correcting any errors in the file sys‐
tem, fsck displays a summary of information about the file system. This
summary includes the size of the file system in bytes, the number of
bytes used in directories and individual files, and the number of
available allocation units remaining in the file system.
OPTIONS
generic_options The following generic options are supported:
-m Check but do not repair. This option
checks that the file system is suit‐
able for mounting, returning the
appropriate exit status. If the file
system is ready for mounting, fsck
displays a message such as:
pcfs fsck: sanity check:
/dev/rdiskette okay
-n | -N Assume a no response to all ques‐
tions asked by fsck; do not open
the file system for writing.
-V Echo the expanded command line, but
do not execute the command. This
option may be used to verify and to
validate the command line.
-y | -Y Assume a yes response to all ques‐
tions asked by fsck.
-o specific_options Specify pcfs file system specific options in a
comma-separated list, in any combination, with
no intervening spaces.
v Verify all allocation units are accessible
prior to correcting inconsistencies in the
metadata.
p Check and fix the file system non-interac‐
tively (preen). Exit immediately if there
is a problem requiring intervention.
w Check writable file systems only.
FILES
special The device which contains the pcfs. The device name for a
diskette is specified as /dev/rdiskette0 for the first
diskette drive, or /dev/rdiskette1 for a second diskette
drive. A hard disk device or high-capacity removable device
name much be qualified with a suffix to indicate the proper
FDISK partition.
For example, in the names: /dev/rdsk/c0t0d0p0:c and
/dev/rdsk/c0t4d0s2:c, the :c suffix indicates the first par‐
tition on the disk contains the pcfs.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────────┤
│Availability │system/extended-system-utilities │
├─────────────────────────────┼─────────────────────────────────┤
│Interface Stability │Committed │
└─────────────────────────────┴─────────────────────────────────┘
SEE ALSOfsck(1M), fstyp(1M), fdisk(1M), mkfs(1M), mkfs_pcfs(1M), mountall(1M),
attributes(5), pcfs(7FS),
WARNINGS
The operating system buffers file system data. Running fsck on a
mounted file system can cause the operating system's buffers to become
out of date with respect to the disk. For this reason, the file system
should be unmounted when fsck is used. If this is not possible, care
should be taken that the system is quiescent and that it is rebooted
immediately after fsck is run. Quite often, however, this is not suffi‐
cient. A panic will probably occur if running fsck on a file system
modifies the file system.
SunOS 5.11 28 Jan 2000 fsck_pcfs(1M)
