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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

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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:


Errors were found and corrected.


Reboot suggested.


Errors were found but not corrected.


fsck encountered an operational error.


fsck was called incorrectly.


A shared library error was detected.



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


Serial mode. Check one filesystem at a time.

-t fstype

Specify the filesystem type. Do not check filesystems of any other type.


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


Display completion (progress) bar.


Suppress normal execution; just display what would be done.


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


Meaningful only with -A: check all filesystems listed in /etc/fstab except the root filesystem.


Suppress printing of title.


Verbose mode.

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