Linux in a Nutshell, 6th Edition

Name

fsck

Synopsis

fsck [options] [filesystem] ...

System administration command. Call the filesystem checker for the appropriate system type to check and repair unmounted filesystems. If a filesystem is consistent, the number of files, number of blocks used, and number of blocks free are reported. If a filesystem is inconsistent, fsck prompts before each correction is attempted. fsck’s exit code can be interpreted as the sum of all conditions that apply:

0

No errors found.

1

Errors were found and corrected.

2

Reboot suggested.

4

Errors were found but not corrected.

8

fsck encountered an operational error.

16

fsck was called incorrectly.

32

fsck canceled by user request.

128

A shared library error was detected.

Options

--

Pass all subsequent options to filesystem-specific checker. All options that fsck doesn’t recognize will also be passed.

-s

Serial mode. Check one filesystem at a time.

-t fstype

Specify the filesystem type. Do not check filesystems of any other type. Multiple filesystem types to check can be specified in a comma-separated list.

-A

Check all filesystems listed in /etc/fstab. The root filesystem is checked first.

-C [fd]

Display completion (progress) bar. Optionally specify a file-descriptor to receive the progress. (Useful for a GUI frontend.)

-M

Don’t check mounted filesystems. Returns a 0 exit code for mounted system.

-N

Suppress normal execution; just display what would be done.

-P

Meaningful only with -A: check root filesystem in parallel with other systems. This option is potentially dangerous. ...