minishell

This is a project for 42Heilbronn school's curriculum.

The goal of this team-project is to write a program creating a simple shell, that provides a command-line interface for users to interact with the operating system. I was responsible for the execution part, my partner Anna Iarinov did the parser.

Features

• Display a prompt when waiting for a new command
• Have a working history
• Search and launch the right executable based on the PATH variable or using a relative or absolute path
• Handle single and double quotes
• Implement redirections (<, >, <<, >>)
• Implement pipes (|)
• Handle environment variables ($ followed by a sequence of characters) which should expand to their values
• Handle $? which should expand to the exit status of the most recently executed foreground pipeline
• Handle the signals ctrl-C, ctrl-D and ctrl-\ which should behave like in bash
• Built-in commands:
  • echo with option -n
  • cd with a relative or absolute path
  • pwd
  • export
  • unset
  • env
  • exit

Description

run make

Before running minishell make sure that you have readline library installed and found by the Makefile. The program will be executed as follows:

./minishell

What i learned

• What are signals and how to use them
• Redirections in bash
• Variable expansion in bash
• How does the bash interpret single and double quotes
• What's a parser
• In depth insight into builtin commands of Bash