This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.
This is an ancient post with no relevance to modern systems.
No filesystem in OSR5, SCO Unix, ODT, or Xenix supports hard quotas.
For another approach, look around ftp://ftp.armory.com/pub/admin/ where you will find, among other things, shell scripts to check users' disk space usage and notify users and administrators when users are using more space than you'd like them to.
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C++ is just an abomination. Everything is wrong with it in every way. So I really tried to avoid using that as much as I could and do everything in C at Netscape. (Jamie Zawinski)