Directory for Simple Shell group Project

Sudo code for the implementation

1. Initialize the Shell

   • Initialize data structures and variables.
   • Display a command prompt.

2. Read and Parse User Input

   • Read the user's input command line.
   • Tokenize the input to separate commands, arguments, and operators.

3. Handle Built-In Commands

   • Check if the entered command is a built-in shell command

   (e.g., "cd," "exit," "echo").

   • Execute built-in commands directly within the shell.

4. Search for the Executable

   • If the command is not built-in, search for the executable

     file in directories listed in the PATH environment variable.

5. Create a Child Process

   • If an executable is found, fork a child process

     to execute the command.

   • The child process loads the executable.

6. Redirection and Piping

   • Handle input/output redirection (<, >, >>) and

     piping (|) if present in the command.

7. Execute the Command

   • In the child process, use exec() functions

     to replace the child's memory image with the command's image.

   • Execute the external command in the child process.

8. Process Management

   • Handle foreground and background processes.
   • Manage process execution, including job control (e.g., fg, bg).

9. I/O Handling

   • Handle input and output streams for the command.
   • Redirect standard input and output if necessary.

10. Environment Variables

    • Manage environment variables, including setting,

      modifying, and using them.

11. Scripting

    • Support shell scripting by interpreting and

      executing shell scripts.

12. Customization

    • Allow users to customize their shell environment

      through configuration files.

    • Support shell startup files (e.g., .bashrc, .bash_profile).

13. Error Handling

    • Handle errors gracefully, display error messages to the user.

14. Cleanup

    • Properly release resources, close files, and

      wait for child processes to complete.

15. Repeat

    • Return to the command prompt and wait for the

      next user input.

16. Termination

    • Handle the "exit" command or a specific exit

      condition to exit the shell.

17. Cleanup and Shutdown

    • Perform any necessary cleanup before exiting the shell.

18. Final Exit

    • Terminate the shell.