05-04-2011
There are two answers to this question...
UNIX is a trade name of the open group.
For the open group to let you call your product UNIX you must meet a standard of quality and a basic set of commands.
but in a more general use of the word, unix is a multi-user OS based on the design of multics from AT&T back in 1960's
A large measure of what makes an OS unix it not so much what it is, its more where it draws its history from.
---------- Post updated at 04:20 PM ---------- Previous update was at 04:17 PM ----------
and as for what I use...
windows for my main system at home.
windows for my desktop at work.
one linux and one open-BSD as servers at home.
300 solaris system and 500 HPUX systems at work.
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TAPEFS(1) General Commands Manual TAPEFS(1)
NAME
32vfs, cpiofs, tapfs, tarfs, tpfs, v6fs, v10fs - mount archival file systems
SYNOPSIS
fs/32vfs [ -m mountpoint ] [ -p passwd ] [ -g group ] file
fs/cpiofs
fs/tapfs
fs/tarfs
fs/tpfs
fs/v6fs
fs/v10fs
DESCRIPTION
These commands interpret data from traditional tape or file system formats stored in file, and mount their contents (read-only) into a Plan
9 file system. The optional -p and -g flags specify Unix-format password (respectively group) files that give the mapping between the
numeric user- and group-ID numbers on the media and the strings reported by Plan 9 status inquiries. The -m flag introduces the name at
which the new file system should be attached; the default is /n/tapefs.
32vfs interprets raw disk images of 32V systems, which are ca. 1978 research Unix systems for the VAX, and also pre-FFS Berkeley VAX sys-
tems (1KB block size).
Cpiofs interprets cpio tape images (constructed with cpio's c flag).
Tarfs interprets tar tape images.
Tpfs interprets tp tapes from the Fifth through Seventh Edition research Unix systems.
Tapfs interprets tap tapes from the pre-Fifth Edition era.
V6fs interprets disk images from the Fifth and Sixth edition research Unix systems (512B block size).
V10fs interprets disk images from the Tenth Edition research Unix systems (4KB block size).
SOURCE
These commands are constructed in a highly stereotyped way using the files fs.c and util.c in /sys/src/cmd/tapefs, which in turn derive
substantially from ramfs(4).
SEE ALSO
Section 5 passim, ramfs(4).
TAPEFS(1)