No matter how much disk space you have, you will eventually run out. One way the system administrator can force users to clean up is to impose quotas on disk usage. BSD UNIX supports a disk quota system that will enforce the quotas the system administrator sets up. Prior to V.4, System V had no quota system at all. In Release V.4, System V supports quotas for BSD-style (UFS) filesystems.
If you're a user, how do quotas affect you? Sooner or later, you may
find that you're over your quota.
Quotas are maintained on a per-filesystem basis. They may be placed on
disk storage (the number of blocks) and on inodes (the number of files).
The quota system maintains the concept of
When you exceed a soft limit, you'll get a warning (
There may also be a quota on the number of files (i.e.,) you can own per filesystem. It works exactly the same way; you'll get a warning when you exceed the soft limit; if you don't delete some files, the system will eventually refuse to create new files.