RAM

Random access memory (RAM) is another term for primary memory. It is the main computer memory.

RARP

Reverse address resolution protocol is used by diskless workstations for translating their own Ethernet addresses into their IP addresses.

Raster Image

Raster images store the display primitives (such as lines, characters, and solidly shaded or patterned areas ) in terms of their component pixels. This is sometimes referred to as a bitmap display.

Raw Device

A raw device receives I/O in an unformatted character stream. Examples of raw devices include serial devices and raw partitions.

reject

The reject command prevents queueing of print requests for the named destinations. A destination can be either a printer or a class of printers. Run lpstat -a to find the status of destinations.

Remote Host

A remote host is a system other than the local one on which the user is working.

Restoring

The process of copying files and directories from tape media to disk is called restoring.

Root

Root is the user name of the superuser account. The superuser is a privileged user with total system access. The terms superuser and root have the same meaning and are used interchangeably.

root Directory

The root directory is the top of the Solaris directory system. All other directories are subdirectories of the root (/) directory.

Run Control Scripts

Run control scripts are scripts that are executed during system initialization and when changing run levels. Commands executed by the run control scripts determine which file systems are mounted, which daemon processes are running, and other environment configuration.

Run Level

A run level is one of the eight initialization states a system can be running in. A system can run in only one initialization state at a time. The default run level for each system is specified in the /etc/inittab file.

Run Level 0

Run level 0 shuts down the system so that it is safe to turn off the power.

Run Level 2

Run level 2 is a multiuser mode without remote resources available. All daemons are running except for remote file sharing daemons.

Run Level 3

Run level 3 is a multiuser mode with remote resources available. All daemons are running including remote file sharing daemons.

Run Level 6

Run level 6 is used to halt the system to run level 0 and then reboot it to run level 3.

Run Level S

Run level S is a single-user mode where the operating system is running, but all users are logged out and most system processes, such as print and mail, are not running. Only one user (the superuser) is logged in to the system. Run level S is convenient for doing backups because, since no users are logged in, all data is stable.