Handbook Prev Chapter 3. The most comprehensive documentation on FreeBSD is in the form of man pages. Nearly every program on the system comes with a short reference manual explaining the basic operation and various arguments. These manuals can be viewed with the man command.
System calls and error numbers.
Functions in the C libraries. Games and other diversions. System maintenance and operation commands. In some cases, the same topic may appear in more than one section of the online manual. This will display the manual page for the user command chmod .