minishell

This project is to create a simple shell. Concepts about processes and file descriptors are introduced.

Working on this project allows you to travel through time and come back to problems people faced when Windows didn't exist.

This is a group project completed by Q. Li & R. Bakker

Technical considerations

The following elements need to work like in bash

• Show a prompt when waiting for a new command

• Search and launch the right executable (based on the $PATH variable or by using relative or absolute path)

• Implement the below builtins:

  • echo with option ’-n’
  • cd with only a relative or absolute path
  • pwd without any options
  • export without any options
  • unset without any options
  • env without any options and any arguments
  • exit without any options

• ; to separate commands

• Pipes |

• ' and " except for multiline commands

• Redirections < > >> except for file descriptor aggregation

• Environment variables ($ followed by characters)

• $? to store exit status of the previous command

• ctrl-C, ctrl-D and ctrl-\

How to test

Run the following commands

$ git clone https://github.com/qingqingqingli/minishell
$ cd minishell
$ make
$ ./minishell

Examples

• Create minishell executable and run

• Start testing!