jiuliwei / unix-shell-simulation

Unix-Shell-Simulation

Introduction:

The shell is essentially a command-line interpreter. It works as follows:

• It prompts you to enter a command.
• It interprets the command you entered.
  • If you entered a built-in command (e.g., cd, jobs, fg, and exit), then the shell runs that command.
  • If you entered an external program (e.g., /bin/ls), or multiple programs connected through pipes (e.g., ls -l | less), then the shell creates child processes, executes these programs, and waits for all these processes to either terminate or be suspended.
  • It can handle the I/O redirection, such as cat > output.txt or cat < input.txt
  • If you entered something wrong, then the shell prints an error message.
• Rinse and repeat until you enter the built-in command exit, at which point it exits.
  • It has signal handling module to ignore termination signals, such as SIGINT, SIGQUIT, SIGTERM and SIGTSTP.

Compiling:

You should load the gcc 9.2.0 with the following command:

module load gcc-9.2

How to run it:

Run make to generate an executable file named nyush in the current working directory. Then run ./nyush.