Very Computer

by **Thomas Schulze-Velmed** » Sun, 03 Jan 1999 04:00:00

Hello alltogether :-)

I would like to know the differnces between the System V.4 "standard"
and the BSD "standard"
I know a few things (e.g. different bootup-techniques) but where can I
find all
differnences. e.g. where can I read what's to do, to have a System V.4 -
complaint un*x?

thanx in advance!

Regards

Thomas SV

by **Victor Wagn** » Mon, 04 Jan 1999 04:00:00

: Hello alltogether :-)

: I would like to know the differnces between the System V.4 "standard"
: and the BSD "standard"
: I know a few things (e.g. different bootup-techniques) but where can I
: find all
: differnences. e.g. where can I read what's to do, to have a System V.4 -
: complaint un*x?

But why?

Really, I think that it is impossible to convert linux into 100% System
V.4 complaint system. At least it have no AT&T originated code in
kernel. It is possible however, and even desirable, to make fully POSIX
complaint system. POSIX standard was mainly SysV based. But don't forget
that there are a lot of useful things which are originated in Berkley.
And Linux tries to get best of both worlds.

: thanx in advance!

: Regards

: Thomas SV
--
--------------------------------------------------------
I have tin news and pine mail...

by **Thomas Schulze-Velmed** » Mon, 11 Jan 1999 04:00:00

Hi Victor,

Quote:> Really, I think that it is impossible to convert linux into 100% System
> V.4 complaint system.

I don't want to convert anything!
I just want to know the differences! (more or less COMPLETE)
For myself, I prefer the BSD-style, anyway.

Thanks in advance

Regards

Thomas

by **Roland Latou** » Mon, 11 Jan 1999 04:00:00

> > Really, I think that it is impossible to convert linux into 100% System
> > V.4 complaint system.
> I don't want to convert anything!
> I just want to know the differences! (more or less COMPLETE)
> For myself, I prefer the BSD-style, anyway.

I'll give it a try. No guarantees on completeness, though.
1)Under BSD, you can be in multiple groups at once.
Under SysV, you can be in multiple groups, but only one at a time.
Look for 'chgrp' command, and see output of 'id'.
2)different printspoolers: BSD is more network-aware
SysV is based on shell scripts
3)different process scheduler:
BSD process scheduler tries to be more 'fair' under college-student
conditions. SysV scheduler is IMHO more performance-oriented.
4)BSD has disk quotas, for dealing with college-student conditions.
5)Different /etc/init and different startup scripts:
SysV init uses /etc/inittab to run scripts in different directories
for different runlevels, with S* and K* to start/stop processes.
SysV also uses /etc/inittab to run its gettys
BSD runs gettys from /etc/gettytab. SysV uses /etc/gettydefs for
control of those gettys.

I'm sure I missed something, and all the linux releases I've seen are a
blend, trying to get the best of both worlds. Some of this may be
influenced by POSIX.

Does that help?
--
Roland Latour Slackware3.4 & PPP http://home.cdsnet.net/~rolandl

Very Computer

System V standard vs. BSD standard -> where to find?

System V standard vs. BSD standard -> where to find?

System V standard vs. BSD standard -> where to find?

System V standard vs. BSD standard -> where to find?

System V standard vs. BSD standard -> where to find?