Learn practical tips for switching run levels in Linux

In the Linux operating system, runlevel (runlevel) is the operating status of the system at different stages, usually represented by numbers. Different run levels correspond to different services and functions. Administrators can switch different run levels as needed to control system behavior. This article will introduce how to switch different runlevels in Linux and provide specific code examples.

1. Understand different run levels

In Linux systems, common run levels range from 0 to 6, and each run level corresponds to different behaviors. The most commonly used levels are as follows:

• Run level 0: System shutdown
• Run level 1: Single user mode
• Run level 2: Multi-user Mode, no NFS service
• Run Level 3: Multi-user mode, full command line mode
• Run Level 4: Reserved, not used
• Run Level 5: Multi-user Mode, with graphical interface
• Run level 6: System restart

2. Method to switch run levels

Method 1: Use the init command

sudo init <runlevel>

For example, to switch to run level 3, you can run the following command:

sudo init 3

Method 2: Use the telinit command

sudo telinit <runlevel>

For example, to switch to run level 5, you can use the following command:

sudo telinit 5

3. Example: Switch from run level 3 to run level 5

First, you can use the following command to view the run level of the current system:

runlevel

Then, use the following Command to switch to run level 5:

sudo telinit 5

4. Notes

• Before switching the run level, please ensure that the data has been saved and the running program has been closed.
• Switching to a different run level may cause some services to start or stop, so please operate with caution.
• Some distributions of Linux systems may use different methods to manage run levels. Please operate according to the actual situation.

Through the above steps, you can easily switch between different running levels in the Linux system and flexibly control the running status of the system. I hope this article can provide you with practical guidance and code examples to better manage your Linux system.

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