System Administration Guide: Advanced Administration
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What Are Quotas?

Quotas enable system administrators to control the size of UFS file systems. Quotas limit the amount of disk space and the number of inodes, which roughly corresponds to the number of files, that individual users can acquire. For this reason, quotas are especially useful on the file systems where user home directories reside. As a rule, the public and /tmp file systems usually do not benefit significantly by establishing quotas.

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