As beautiful as a shell
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 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.
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.
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Download/Clone this repo
git clone git@github.com:MikelTolino/minishell.git -
cdinto the root directory and runmakecd minishell make
After building the source, run ./minishell from the project root.
- 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.
- 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
- ’ inhibit all interpretation of a sequence of characters.
- " inhibit all interpretation of a sequence of characters except for $.
- '<' 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 | 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.
- ctrl-C
- ctrl-D
- ctrl-\