Perhaps the most common type of filesystem problem is files that are accidentally deleted. Users frequently delete the wrong files or delete a file only to discover that it's actually needed. Windows system users may be accustomed to undelete utilities, which scour the disk for recently deleted files in order to recover them. Unfortunately, such tools are rare on Linux. You can make undeletion easier by encouraging the use of special utilities that don't really delete files, but instead place them in temporary holding areas for deletion later. If all else fails, you may need to recover files from a backup.
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