Скачать или смотреть C - Build Your Own Shell in C, Zsh Implementation Part 5: Implementing External Command Execution

In this part of our shell-building tutorial, we implement the ability to execute external commands. This feature allows our custom shell to find executables in the system’s PATH, execute them, and handle errors if the commands fail. By the end of this video, your shell will be able to run commands like ls, cat, and executables in our directory, just like a real terminal!

Code:
https://github.com/Cukowski/MyShell_Zsh

Timestamps:

[00:00] Introduction: Overview of external command execution.
[03:00] Understanding execve: How system calls are used to execute external commands.
[10:00] Setting Up the Executor: Implementing the executor function to handle child processes.
[25:00] Managing Paths: Retrieving and splitting the PATH environment variable.
[35:00] Implementing child_process: Searching for the executable in system paths.
[50:00] Error Handling and Debugging: Handling cases where commands are not found or fail.
[54:00] Recap and Testing: Final testing and summary of the external command executor.
What you’ll learn:

How to use fork() and execve() to create child processes.
Managing environment variables for external command execution.
Techniques to search and handle executables in the system PATH.
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