Tiny Shell

• Demo
• Source
  • github.com/khalilv/tinyShell
• Details

  This was a project for an operating systems course I took during my third year at McGill. It is a mock shell implemented in C. You can input commands directly into this program and the shell will execute them. You can pass a file into the program and the shell will run all the commands in the file and then terminate. You can also add a FIFO as an input and the shell will run FIFO mode. This will use the named pipe to execute commands.

  For internal commands, the shell can accept four.

  • history: shows up to the last 100 commands executed
  • chdir: changes the working directory. Works with absolute and relative paths.
  • limit int: sets the soft limit of RLIM_DATA.
  • checklim: displays the current hard and soft limits of RLIM_DATA.

  For signal handling, the shell can handle two cases.

  • CTRL^C: the shell will display a message asking the user if they would like to terminate the program. If yes, the shell will terminate. If no, the shell will continue.
  • CTRL^Z: the shell will ignore this command and keep running.

  This project was a great experience for me to explore concepts of low-level programming such as memory allocation, processes and inter-process communication, threads, and signal handling. It was one of my more difficult assignments but insightful with a cool end product.