On 16/02/2024 21:43, karl@??? wrote:

> Not everything in Linux/Unix is a file.
> Examples:
> . network devices
> . sysv ipc

The networking stuff came from Berkeley, and was pretty separate from
the rest of UNIX. The Bell Labs Research UNIX was moving towards having
the network as files - can't remember if it already was in V9 or V10,
but definitely in Plan 9.

SysV stuff came from USG/USL, the less said about that the better...

    Julf