so... Multics is a Unix
almost, anyway
- hierarchical file system, but the root is '>' rather than '/'
- shell, check
- case sensitive file system, check
- Commands like ls, cat, echo, mkdir, rmdir, touch: Multics has list (ls), print (pr), echo, createdir (cd), deletedir (dd), touch .. close enough.
- Plain text files, check
- commands connected with redirection and pipes: redirection, yes. the pipe symbol was not added to Multics till the 80s in imitation of Unix.
(the initial Multics I/O system was mostly designed by Bell Labs folks)
additional details: https://multicians.org/unix.html