If you're interested in how a simple version of unix works, I highly recommend checking out Xv6, a teaching OS based on UNIX version 6: https://pdos.csail.mit.

If you're interested in how a simple version of unix works, I highly recommend checking out Xv6, a teaching OS based on UNIX version 6: https://pdos.csail.mit.edu/6.828/2012/xv6/book-rev7.pdf https://pdos.csail.mit.edu/6.828/2012/xv6/book-rev7.pdf