rshell runs a command shell that executes commands that are located in the bin directory.
$ git clone https://github.com/echan031/rshell.git
$ cd rshell
$ git checkout hw1
$ make
connector && executes the same way as ;\n connector || executes the same way as ; ls -R does not work correctly; ls does not sort output alphanumerically; ls arguments do not work correctly together;