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While browsing through the web and local documents, I often see expressions like this:

See apt(8) for more information about the available commands.

My question is, what does the number here stand for?

marked as duplicate by Kusalananda, Stephen Kitt, Jeff Schaller, roaima, muru Feb 13 '17 at 12:33

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From the "man man":

MANUAL SECTIONS The standard sections of the manual include:

1      User Commands
2      System Calls
3      C Library Functions
4      Devices and Special Files
5      File Formats and Conventions
6      Games et. al.
7      Miscellanea
8      System Administration tools and Daemons

Distributions customize the manual section to their specifics,
which often include additional sections.

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