For this project, you and your partner will design and implement a simple command$-$line shell,

similar to bash or zsh$.$ Your program, mysh$,$ will provide interactive and batch modes, both of

which will read and interpret a sequence of commands.

This project will provide experience of

$$ Posix $($unbuffered$)$ stream IO

$$ Reading and changing the working directory

$$ Spawning child processes and obtaining their exit status

$$ Use of dup$2()$ and pipe$()$

$$ Reading the contents of a directory