Using external processes can improve performance of your application if used correctly. We can execute shell commands with these child processes. The child_process module creates new child processes of our main Node.js process. RUNJS IN LINUX HOW TOWhen a new process is created, the Operating System determines which processor it uses and how to schedule its tasks. However, it is sometimes desirable to create another process to execute code. These various threads are run in the same Node.js process. When they are complete, the code in the callback, or error, is returned to the main, single thread. Asynchronous tasks in Node.js are executed in other internal threads. However, that does not mean that all of its processing is done in that one thread. Node.js executes its main event loop in a single thread. In this article, we will learn the various ways to execute shell commands in Node.js using the child_process module. Therefore, we can write most of these complex operations in JavaScript instead of the shell scripting language, potentially making the program easier to maintain. With Node.js, we can run shell commands and process their inputs and outputs using JavaScript. Many applications also need to interact with the file system and other OS-level components, which is often more easily done with command line level utilities. However, a developer might prefer to use a more general higher-level language for complex tasks. When working with servers, automated tasks are frequently scripted with shell scripts. System administrators and developers frequently turn to automation to reduce their workload and improve their processes.
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