I've just finished a 3-day bespoke course in HP-UX, and I must say I like it. It's my first foray into proprietary UNIX, and a SysV system at that. Some of the things I learned:
- The LVM system and VxFS rocks.
- Init scripts are in
/etc/…as on Linux.
- Default runlevel is controlled with
/etc/inittab, just as expected.
- Booting to runlevel 3 will execute all the scripts in
/sbin/rc.3.d/*sequentially, very different from Linux.
- The patch and software management is very good, better than anything else I know of, much to my surprise.
There were many other things of course, but these were what was discussed today or made the biggest impression.