If you are genuinely interested in creating a working shell, take a look at POSIX shell specification[1] and list of and functionality of command-line utilities

If you are genuinely interested in creating a working shell, take a look at POSIX shell specification[1] and list of and functionality of command-line utilities[2]. If you implement most of it then you would be able to call your project a POSIX shell. [1] https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V... [2] https://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html https://pubs.opengroup.org/onlinepubs/9699919799/idx/utiliti...