RUN LEVEL Meaning and
Definition
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A run level is a term used in operating systems, particularly Unix-like systems, to describe a specific operational state or mode in which the system is running. It refers to the pre-defined configurations and processes that are active at a specific point in time during the startup process or system initialization.
In Unix-like systems, such as Linux, run levels are numbered from 0 to 6, where each run level represents a different operational state. The definition and functionality of these run levels may vary depending on the particular Unix-like system. However, some common run levels include:
- Run level 0: Also known as the shutdown state, where the system is halted and turned off.
- Run level 1: This is the single-user state or maintenance mode, where only essential services and basic functionality are available. It is often used for troubleshooting and system recovery.
- Run levels 2 to 5: These run levels are typically multi-user states where various services and processes are active, allowing users to log in and access the system.
- Run level 6: Known as the reboot state, where the system is restarted.
Switching between run levels can be done manually by a system administrator or automatically during system startup or shutdown. Each run level defines a different set of services and processes that are started or stopped, allowing for flexibility and customization of system behavior based on different operational requirements.
Common Misspellings for RUN LEVEL
- eun level
- dun level
- fun level
- tun level
- 5un level
- 4un level
- ryn level
- rhn level
- rjn level
- rin level
- r8n level
- r7n level
- rub level
- rum level
- ruj level
- ruh level
- run kevel
- run pevel
- run oevel
- run lwvel
Etymology of RUN LEVEL
The term "run level" is derived from the field of computer science, particularly in relation to the Unix and Linux operating systems.
The word "run" in this context refers to the initiation or execution of a computer program or system. It represents the state in which the computer system is operational, actively running various processes and programs.
The term "level" refers to different states or modes of operation in which a computer system can operate. In Unix and Linux, run levels define distinct states of the system, each with a specific set of processes and services running.
The concept of run levels can be traced back to the earlier Unix systems that used a series of numbers (0-6) to represent different operational states. Each run level had a different purpose, such as single-user mode, multi-user mode, or system shutdown.
