May 2018
Beginner
332 pages
7h 28m
English
Content preview from Learning Linux Shell Scripting - Second Edition
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Understanding run levels
There are seven run levels. The system will be started in run level 1 to 5. Run level 0 is used for shutting down the system. Run level 6 is used for rebooting the system. The graphical user interface is started in run level 5. The following is the summary of the different run levels:
|
Sr. No. |
Run level number |
Description |
|
1 |
0 |
Halting the system |
|
2 |
1 |
Single-user mode |
|
3 |
2 |
Multi-user mode |
|
4 |
3 |
Multi-user with network support |
|
5 |
4 |
Not used |
|
6 |
5 |
Graphical user interface with multi-user and networking support |
|
7 |
6 |
Rebooting the system |
We need to be in the root-user mode to use the init command.
If we give the following command, then the system will shut down: ...