21 Feb
2006
21 Feb
'06
6 p.m.
Brian S Walden wrote:
A slightly awkward [1] 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.)
[1] Not really awkward, because the introduction of shell functions
is a quite frequently mentioned feature to identify SVR2.
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.