[matheusmoreira]

I agree. In the post about ls, I expected to read about how the program builds the list of files and directories, which system calls are involved and so on. The author doesn't seem to like reading C source code and that's fine. Studying the strace of a simple ls invocation and cross-referencing with the Linux man pages would have revealed the inner workings of the program, though.

>It’s largely the kind of stuff that higher level languages implement in their standard library

I think it's extremely interesting. It's in these libraries that the hidden fun stuff happens. For example, memory allocation and related terms like the heap seem like magic but it becomes clearer once one learns about how it works.