Man pages are the extensive documentation for various programs, commands, libraries in Unix and Unix-like operating systems. They are divided by type into sections.
| Sections | ||
| 1 | Executable programs or shell commands | intro(1) |
| 2 | System calls (functions provided by the kernel) | intro(2) |
| 3 | Library calls (functions within program libraries) | intro(3) |
| 4 | Special files (usually found in /dev) | intro(4) |
| 5 | File formats and conventions eg /etc/passwd | intro(5) |
| 6 | Games | intro(6) |
| 7 | Miscellaneous (including macro packages and conventions) | intro(7) |
| 8 | System administration commands (usually only for root) | intro(8) |
| 9 | Kernel routines [Non standard] | intro(9) |
More information at man(1).