[ORioN63]

Is there something like FUSE for a single file?

My use case is for pass. I like to keep my secret files in there, but I still have plain text redudancy, because, well, encrypted files are useless while encrypted.

I would like to have a "virtual file" which any program could accept as its config file where I could control the results of `read()`

In my case, I would associate the current file to its pass equivalent, decrypt the pass equivalent and return the decrypted data.

[dallbee]

Sure, fuse actually implements the lesser known CUSE protocol as well. Stands for character device in user space, and does exactly what you describe.

[callesgg]

That is exactly how fuse operates.