An example: what the system contains

When an SCO OpenServer system is installed, many directories are created automatically. The following figure shows a partial structure of a UNIX root filesystem. (A full root filesystem would be too large to show here.)

/

The root directory is the root of the filesystem tree. Every directory is a subdirectory of root.

/bin and /usr/bin

These directories contain most of the UNIX system commands. Generally, standard UNIX commands and applications are held in /bin, whereas group-specific commands and applications, that is, those used by a particular group of users, are held in /usr/bin.

/dev

This directory contains all the special device files. Special device files are access points to all the peripherals connected to the system.

/etc

This directory contains many of the system configuration files and system administration commands.

/unix

This file contains the UNIX kernel program. This program is loaded into memory when the operating system starts up. It is the heart of the SCO OpenServer system; for more information see ``The UNIX system kernel''.

/usr/lib

This directory contains many application library files.

/usr/spool

This directory is used by many commands for storing temporary files or files in a queue.

/var/opt/

This directory contains storage sections. See ``Creating a link to a directory'' for information about symbolic links and storage sections.