How the Linux Kernel Executes Shebang Scripts

This article delves into how the Linux kernel handles shebang (#!) scripts. Starting with a simple shell script, the author traces the kernel execution flow, revealing the crucial roles of the `execve` syscall, the `binfmt_script` module, and the `load_script` function. The author meticulously explains how the kernel reads the shebang, locates and executes the specified interpreter, ultimately running the script. The article contrasts the execution differences between scripts with and without shebangs, and explores the permission checking mechanism, offering readers a fascinating glimpse into the inner workings of the Linux system.