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Linux starts many unnecessary services (programs) that are not used immediately after installation.Services that are not used consume server resources unnecessarily just by being started and running, which is not desirable for security measures.There are two commands to stop services: service and chkconfig, but the service command will cancel the settings and start the stopped service when the server is restarted.Stop the service with the chkconfig command, which will keep the service stopped even after restarting the server.

In the case of Linux, there are processes that run specifically for system maintenance without the need to give any instructions.These processes are called daemons, and they wait until there is a request from the user, and when there is a request, they create a new process and execute the process.The process created here is called a child process, and if it is set to run at a certain date and time in advance, it will execute the reserved process at the reserved date and time.Basically, these daemons are executed according to the user's settings, but some of them are default (standard) settings. Since these daemons are not operated by the user in a control terminal such as a console or terminal emulator, they will not be displayed in the control terminal when the ps command is executed, but you can display these processes by adding the option "-x".

To terminate a running process, use the kill command.You nee...

●Display the CPU information installed on the PC.To display the CPU information installed in the PC, refer to the "/proc/cpuinfo" file.This information is used to know the CPU load for top command, etc.