check and repair MS-DOS filesystems
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-w Write changes to disk immediately.
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-r Interactively repair the filesystem. The user is asked for advice whenever there is more than one
approach to fix an inconsistency.
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-l List path names of files being processed.
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-a Automatically repair the filesystem. No user intervention is necessary. Whenever there is more than
one method to solve a problem, the least destructive approach is used.
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-v Verbose mode. Generates slightly more output.
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-t Mark unreadable clusters as bad.
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