Douglas W. Topham has written:

'A system V guide to UNIX and XENIX' -- subject(s): UNIX System V (Computer file), XENIX (Computer file)

'The first book of UNIX'

'UNIX and XENIX' -- subject(s): UNIX (Computer file), XENIX

Peter W. Gofton has written:

'Mastering UNIX serial communications' -- subject(s): Operating systems (Computers), UNIX (Computer file)

'Mastering serial communications' -- subject(s): Digital communications, IBM Personal Computer, Programming

There are many ways to do this, but the fastest and easiest is to use the 'uptime' command, which will tell you in a summary line how many users are logged in.

UUCP is the abbriviation of Unix to Unix copy. It is worldwide email system called UUCP or Unix to Unix copy.This email system was developed for the operating system called Unix.

No, but Linux is based on Unix since Linux is a Unix clone.