This is a POSIX-compliant shell very similar to Bash that I wrote in C. It's capable of interpreting shell commands, running external programs and builtin commands (type, cd, pwd, echo, history, and exit).

In addition, the shell is capable of autocomplete for builtin commands as well as custom executables found in the user's PATH.
Stdout and stderr redirection (> or 1>, 2>, >> or 1>>, 2>>) as well as pipelines (|) are supported.

To compile, open a command line, cd into the src folder, and run gcc -o main main.c. If you see an error related to undefined symbols for arm64 architecture, such as in the screenshot below, then instead run gcc -o main main.c -lreadline.

If you're curious, the readline library enables autocomplete by allowing the program to read inputs as they are typed, rather than waiting for a newline character.

Once main.c has been compiled, you'll see an executable called main in the same directory as main.c. Simply run it with ./main.

Once main.c has been compiled (which may require something like WSL or MinGW if you are using gcc), you'll have an executable file called main.exe in the same directory as main.c. Simply run it with .\main.exe.

You'll know everything worked when you see a prompt ($) show up.

From there, treat it like a normal shell! Try out some builtin commands such as echo, type, cd, pwd, and history. You can also use external commands such as cat, ls, git and more, as long as they are in your PATH.

If you want to close the shell at any point, type exit at the prompt and press Enter.