reupload because i mixed up sigterm and sigkill like a dumb fuck
this post was submitted on 05 Jun 2026
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I think a file delete just removing an adress and not the actual data is common to all OSes. That's why to safely erase data from a disk it is recommended to fully overwrite the disk with random data, potentially multiple times.
If you delete a still opened file on Linux then the file will disappear for all processes which didn't already open it, all programs that did already open it can still read and write to it and the file on disk will never be overwritten (as in, used for other files) as long as there's still a process with the file open.
Simplifying how it works: The file you see is a link to the actual file(inode), when a program opens a file using this link they get a copy of the link. As long as one link/copy of it still exist the file won't be deleted. When a program closes all its links get cleaned up so on shutdown all files which only have processes referring to them get marked as deleted.
that's a different thing. if you delete a file that is still opened by a process, the space will not get freed up until that process also closed the file. until that point the filesystem still keeps track of the file, it is just not present in any directories anymore.