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[Ian Northeast]

Tethys wrote:
> Ian Northeast writes:
> 
> 
>>>>3. How do you find out the disk usage of a directory?
>>>
>>>It depends upon which *NIX variant you are running. Assuming Linux as this
>>>is gllug:
>>
>>>du
>>
>>I'm not aware of *any* *nix of which the above isn't true and I've used 
>>most of the common ones (and some uncommon ones:) Do you know of any 
>>where it isn't?
> 
> 
> OS/390, perhaps? du is part of the User Portability Utilities group,
> which is optional for a Unix system. Admittedly, virtually all of them
> have it, but it's possible there's a Unix out there that doesn't...

Unfortunately I don't have access to a zOS (that's what OS/390 is called 
nowadays) box to check, but I'm pretty sure its UNIX personality does 
have du. It's very similar to AIX V3 and that did. It certainly has df.

IMO it's arguable that OS/390 or zOS should be called "UNIX". They can 
be because IBM possess the requisite license, but they aren't remotely 
like any normal *nix system. You have to IPL (boot) them into their 
native MVS style which isn't UNIX by any manner of description and then 
invoke "Open MVS" mode to get a shell and a heirarchical filesystem 
(which is physically implemented within datasets). I worked for a 
company running UNIX (AIX) and Linux and also OS/390 and zOS, from 
before MVS and its successors acquired this "UNIX" personality until 
last month. I was heavily involved in interoperability, but I never 
found a use for Open MVS. I tried it for a few things, but I always 
found it best to "hand off" Internet communications etc. to a real UNIX 
or Linux system.

Regards, Ian

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