[TUHS] AT+T UNIX PC Information needed
mascheck at in-ulm.de
Wed Feb 22 03:00:55 AEST 2006
Brian S Walden wrote:
> Duncan Anderson asks:
>> Is the lack of streams the main difference between the 2 and 3?
> SVR3 also added shared libraries and RFS. As for TCP/IP the popular
> implementation was from Wollongong.
A slightly awkward  but quite comfortable approach to
distinguish the Research/AT&T releases is identifying the shell.
New in the SVR3 shell (features easy to test):
- "getopts" built-in
- "read" knows the error message "missing arguments"
(- "cd" diagnostics. Some vendors modified these again, though.
Stock SVR3: cd formerly only knew "bad directory" and now there
are "not a directory", "does not exist", "permission denied" and
two diagnostics concerning remote file systems.)
 Not really awkward, because the introduction of shell functions
is a quite frequently mentioned feature to identify SVR2.
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