Where can I find the source code for standard Linux commands?

Question

linux

I want to see how standard Linux commands are implemented.
For example: ls, pwd, mkdir, touch, etc.

Found some linux repositories but can't find these commands.
Can you please tell me where you can see their implementation?

Answer 1

Here: https://www.gnu.org/software/coreutils/

Answer 2

See shell sources, that is, shell, that is, bash.