课程: Linux CentOS 7: Shells and Processes

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Introduction to processes

Introduction to processes - Linux教程

课程: Linux CentOS 7: Shells and Processes

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Introduction to processes

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- [Instructor] A program is an executable file that is stored on disk. A program is a passive entity until it is launched, at which time it becomes a process. This makes a process a running instance of a program. When a process is created by running a program, it's allocated some system resources including memory and a process ID number, or PID. Every process has a unique ID number. Each process has a parent process that started it. This parent process also has a process ID number. A process can spawn other processes called child processes. The process ID number is used by the kernel to manage and control the process during its lifetime. System administrators use the process ID for changing task priority and ending tasks. Processes are organized in a hierarchical manner, just like files and folders. So the child processes are nested under the parent processes, and so on. When a process ends, it is reported back to the…

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