fsck

Filesystem consistency check and interactive repair.

SYNTAX
      fsck [options] [filesystem] ...

OPTIONS

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

  -r     Interactive mode; prompt before making any repairs.

  -s     Serial mode.

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

  -A     Check all filesystems listed in /etc/fstab.

  -N     Suppress normal execution; just display what would be done.

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

  -T     Suppress printing of title.

  -V     Verbose mode.

EXIT CODES

  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.

  128  A shared library error was detected.

The return status is the exit status of the last command executed in consequent-commands, or zero if none were executed.

"Politics is the art of looking for trouble, finding it, misdiagnosing it, and then misapplying the wrong remedies." - Groucho Marx

Related commands:

reboot - Reboot the machine

Journaling file systems avoid the need to run fsck -
ext2 File System is non journaling
ext3 File System - Red Hat's Journaling File System
XFS File System - SGI's open source high-performance journaling filesystem.
JFS Tech - IBM's journaled file system technology
Reiser4 - The default file system for SuSE, Lindows, FTOSX and Gentoo.