The lost+found directory at the root of a filesystem is where the filesystem repair command fsck puts chunks of data that do not belong to any file.

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What is the purpose of the lost+found folder in Linux and Unix?

There is a folder at the root of Linux and Unix operating systems called /lost+found/ What is it for? Under what circumstances would I interact with it? How would I interact with it?
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Restore from lost+found

There was a problem on an EXT4 FS/memorycard and after and fsck all the files were put in the lost+found. Question: how can I restore the old filename/hierarchy from the lost+found? Or it is ...