Disk quotas and the like: is there a standard?

[Guy Harris]

>Unix has had exactly this since around 1983, you must be referring to
>SYSV. I believe SYSVR4 finally adds these and other Unix features, so
>the issue is moot.

Some versions of UNIX, anyway.  I don't know that S5 as it comes from
AT&T is the only exception; most of the code to handle quotas tends to
show up in the file system, and there are a number of different file
system types on UNIX systems - does AIX 3.x's journaling file system, or
SGI's extend file system, neither of which are the "traditional" V7/S5
file system, have quotas?

The 4.2BSD file system has them, and I suspect most systems that provide
that file system support quotas on it; S5R4 is one system that does. 
S5R4 doesn't provide quotas on V7/S5 file systems.