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Short for file system check, fsck is a system utility that is used to check and repair inconsistencies in Unix and Unix-based file systems, including Linux. Fsck can be run in one of two modes:

  • Interactive mode is where fsck scans the file system and, at each error, prompts the user to correct or continue without making changes to the file system.
  • Noninteractive mode allows fsck to run and repair all problems it finds automatically without user input.

On a Windows-based system, the equivalent utility is called chkdsk.

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