❑ Unix System V series.
| Section | Description |
| 1 | General Command |
| 1M | System Management Command, Daemon |
| 2 | System call |
| 3 | Library |
| 4 | File format, convention |
| 5 | Miscellaneous |
| 6 | Game, Screensaver |
| 7 | Special file, driver |
| 9 | Kernel |
❑ Linux, BSD, OS X series.
| Section | Description |
| 1 | General Command |
| 2 | System call |
| 3 | Library |
| 4 | Special file, driver |
| 5 | File format, convention |
| 6 | Game, Screensaver |
| 7 | Miscellaneous |
| 8 | System Management Command, Daemon |
※ e.g. man 3 printf, man 1 printf