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🐚 Minishell

demo

As beautiful as a shell

🆎 About

The objective of this project is for you to create a simple shell. Yes, your little bash or zsh. You will learn a lot about processes and file descriptors.

👣 A brief introduction

The existence of shells is linked to the very existence of IT. At the time, all coders agreed that communicating with a computer using aligned 1/0 switches was seriously irritating. It was only logical that they came up with the idea to communicate with a computer using interactive lines of commands in a language somewhat close to english. With Minishell, you’ll be able to travel through time and come back to problems people faced when Windows didn’t exist.

🧰 Installation & Usage

📑 Requirements

The only requirements are:

  • GNU make (v3.81)
  • Clang version 11.0.0
  • Readline: stable 8.1.2

Those versions are the ones used during development.

🔧 Building the program

  1. Download/Clone this repo

    git clone git@github.com:MikelTolino/minishell.git

  2. cd into the root directory and run make

     cd minishell
 make

🏃 Running the program

After building the source, run ./minishell from the project root.

📖 Main Project Instructions

  • Show a prompt when waiting for a new command.
  • Have a working History.
  • Search and launch the right executable (based on the PATH variable or by using relative or absolute path)
  • Environment variables ($ followed by characters) expand to their values.

🏗️ Builtins:

  • echo with option -n
  • cd with only a relative or absolute path
  • pwd with no options
  • export with no options
  • unset with no options
  • env with no options or arguments
  • exit with no options

◻️ Quoting

  • ’ inhibit all interpretation of a sequence of characters.
  • " inhibit all interpretation of a sequence of characters except for $.

🔄 Redirections:

  • '<' redirect input.
  • '>' redirect output.
  • “<<” read input from the current source until a line containing only the delimiter is seen.
  • “>>” redirect output with append mode.

↪️ Pipes

  • Pipes | The output of each command in the pipeline is connected via a pipe to the input of the next command.
  • $? expand to the exit status of the most recently executed foreground pipeline.

📶 Signals (Work like in bash)

  • ctrl-C
  • ctrl-D
  • ctrl-\

🔗 Links