exec

exec is a system call in Unix-like operating systems that replaces the current process image with a new one, typically used to execute another program. It is a fundamental part of process management, allowing programs to launch and run external commands or applications. The eval function, often found in programming languages like Python, JavaScript, and Bash, dynamically evaluates and executes code from a string at runtime.

Also known as: execve, exec family, eval function, evaluate, dynamic execution

Why learn exec?

Developers should learn exec for system-level programming, shell scripting, and process control in Unix environments, such as when creating daemons or managing child processes. eval is useful for dynamic code execution, metaprogramming, and configuration parsing, but should be used cautiously due to security risks like code injection. Both are essential for tasks requiring runtime flexibility or low-level system interaction.

Learning Resources

• docs: Linux man page for exec
• docs: MDN Web Docs on eval
• tutorial: Python eval() Tutorial
• tutorial: Bash eval Command Explained
• course: System Calls and Process Management Course