MyShell

How to Compile

make

How to Run

$ ./myshell

Source Chart Flow

Show prompt

Read command

Parse command

Check if built-in Command

- cd        :  change a working directory  
- exit      : kill all child process and terminate shell 
- jobs      : show all running or suspended background process 
- fg        : change suspended or running background process into running foreground process
- bg        :change suspended background process into running background process
- kill      : kill the process 

Fork child process

Wait child process to be terminated (if it is a foreground process)

In Child Process

if it is a pipe process
    open pipe with using pipe() function 
    duplicate piped file descriptor with STDIN or STDOUT 
    close all unused file descriptor (important!)

execute proceess with execvp() function

In Parent(Shell) Process

    if(Child process is on background)


    else (foreground)
        wait child process to be terminated (with waitpid() function)