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In Linux file system, there are files such as /dev/zero and /dev/random which are not real files on hard disk.
Is there any way that we can create a similar file and tell it to get ouput from executing a program?
For example, can I create file, say /tmp/tarfile, such that any program reading it actually gets the output from the execution of a different program (/usr/bin/tar …)?
It is possible to create such a file/program, but it would require creation of a special filesystem in order to insert hooks into the VFS so that accesses can be detected and handled properly.