Demystifying the (Shebang): Kernel Adventures

a year ago

The shebang (#!) specifies the interpreter for executing a script.
The Linux kernel handles the shebang functionality, not the shell.
The `execve` syscall is used to start running a program from a file.
The kernel checks for the shebang in the file's first line to determine the interpreter.
If a script lacks a shebang, the shell may fall back to using `/bin/sh` as the interpreter.
The `binfmt_misc` kernel feature allows invoking non-native programs by matching magic bytes or file extensions.
Execute permissions are checked by the kernel during the `execve` syscall.

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