Starting and Stopping the System and Services
Using Linux commands, you can start and stop the system or start and start services, such as the Apache web server.
Starting and Stopping the System
Generally, you start your system by turning on its power. However, you can use a Linux command to cause a system to restart itself. If you enter the command:
shutdown -r now
the system will immediately begin to shut down. Once it’s shut down, it will reboot. If you want to provide a delay before commencing the shutdown, use this form of the command:
shutdown -r +mm
where mm
gives the number of minutes
until the shutdown commences. The command displays a message to
system users who have active shells displaying a command prompt. After
commencement of a shutdown, users cannot initiate new login
sessions.
If you want to halt the system, that is, shut down the system without causing it to reboot, use the command:
shutdown -h now
Starting and Stopping Services
Services are daemon programs that run without an associated console. They listen for network connections from clients, which request them to perform an action or provide information. Table 7-1 describes some of the most important services.
Table 7-1. Important Services
Service |
Function |
---|---|
|
Web server |
|
Runs commands at predefined times. |
|
Runs commands at predefine times; offers more flexibility than |
|
Mail transfer agent. |
|
Provides cut and paste to virtual consoles. |
|
Controls the printer. ... |
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