minishell

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. The program is capable of parsing a prompt and launching executables with arguments, along with a few built-in functions.

Skills

• Rigor
• Unix
• Imperative programming

Use

Use make will to create the minishell executable.

Then run: ./minishell

Available otpions

Minishell runs executables from an absolute, relative or environment PATH (/bin/ls or ls), including arguments or options. ' and " work as in bash, except for multiline commands.

You can separate commands with ;, and use redirections > >> < as well as pipes |.

Environment variables are handled, like $HOME, including the return code $?.

Finally, you can use Ctrl-C to interrupt and Ctrl-\ to quit a program, as well as Ctrl-D to throw an EOF, same as in bash.

A few of the functions are "built-in", meaning we don't call the executable, we re-coded them directly. It's the case for :

• echo with option -n
• pwd without options
• cd with an absolute or relative path
• env without options nor arguments
• export without options
• unset without options
• exit without options

You can navigate through the command history using up and down arrows and edit them inline with left and right arrows.

Example

Grade : 96/100