An exit code, also known as a return code or exit status, is a numerical value that is returned by a software application or process when it terminates.

This code serves as a way for the program to communicate the outcome of its execution to the operating system or calling process. Exit codes are typically used to indicate whether a program completed successfully or encountered an error during its execution.

A value of 0 usually signifies that the program exited without any issues, while non-zero values are used to indicate the presence of errors or other exceptional conditions. In practical terms, exit codes are essential for scripting and automation purposes, as they allow developers and system administrators to determine the success or failure of a command or script and take appropriate actions based on the result.

For example, a script can be designed to check the exit code of a command and trigger a notification or rollback procedure if an error occurs. Understanding exit codes is crucial for troubleshooting software-related issues, as they provide valuable insights into the root causes of failures and help streamline the debugging process.

By analysing the exit codes returned by a program, developers can pinpoint the specific errors that occurred and take steps to address them effectively. In summary, exit codes play a vital role in software development and system administration by enabling seamless communication between programs and the operating system.

By leveraging exit codes effectively, developers can enhance the reliability and efficiency of their software applications and streamline their troubleshooting efforts.