The Binary Number System

The Octal Base (Base 8)

Learn how to work in base 8 (octal).

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The Binary Number System

The Octal Base (Base 8)

Base 8 numbers (octal) also take less space than binary (base 2) numbers. In fact, you can represent 3 bits of information with only one space using octal! For this reason, it's used for Unix file permissions. Have you ever wondered why a file has a permission like 776? Well those are octal numbers representing the permission bits (read, write, execute) for each type of user (owner, group, everyone else).

  • Computer Science
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