Kenneth. Ingham has written:

'The kingdom of Toro in Uganda' -- subject(s): History

'UNIX tool building' -- subject(s): UNIX (Computer file)

'Milton Obote' -- subject(s): Politics and government, Presidents, Biography

'A history of East Africa' -- subject(s): History

'The making of modern Uganda' -- subject(s): History

1970.

"As Ritchie summed up the effort, "Although it was not until well into 1970 that Brian Kernighan suggested the name 'UNIX,' in a somewhat treacherous pun on 'Multics,' the operating system we know today was born."

http://www.bell-labs.com/history/unix/almost.html

It depends on the shell you are using, but a standard seems to be 1024 of the last commands.

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.