Linux - L3
Linux is an open-source operating system known for its security, stability, and flexibility. It is used on computers, servers, and even mobile devices. Unlike Windows or macOS, Linux is free and comes in different versions called distributions, like Ubuntu and Fedora. It is popular among developers and businesses because it is customizable and reliable. Many websites, apps, and cloud services run on Linux due to its strong performance.
In Linux, a process is a program in execution, an active instance of a program, and everything that happens on Linux starts with a process. Each process has a unique Process ID (PID) and can be in various states, including running, sleeping, stopped, or zombie.
Each program or command in Linux creates only one process, but an application on the other hand can initiate multiple processes to fulfill different tasks. In Linux systems, processes are often created by forking off from an existing process known as the parent process.