Minishell

This project goal is implementation of shell program. This is for making better understanding about multi processing and multi thread.

1. Outline

• 2022-05-15 Minishell Project start
• 2022-05-17 First official team meet-up
• 2022-05-20 Minishell Master branch init and branch strategy applied.
• 2022-05-23 Second official team meet-up

2. Common Instructions

This project comply with common rules of 42 Seoul on C programming.

3. Mandatory part

This shell can work like following indications.

• Not interpret unclosed quotes or unspecified special characters like \ or;.
• Not use more than one global variable, think about it and be ready to explain why you do it.
• 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)
• It must implement the 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
• ’ inhibit all interpretation of a sequence of characters.
• " inhibit all interpretation of a sequence of characters except for $.
• Redirections:
  • < should redirect input.
  • > should redirect output.
  • << read input from the current source until a line containing only the delimiter is seen. it doesn’t need to update history!
  • >> should redirect output with append mode.
• Pipes | The output of each command in the pipeline is connected via a pipe to the input of the next command.
• Environment variables ($ followed by characters) should expand to their values.
• $? should expands to the exit status of the most recently executed foreground pipeline.
• ctrl-C ctrl-D ctrl-\ should work like in bash.
• When interactive: - ctrl-C print a new prompt on a newline. - ctrl-D exit the shell. - ctrl-\ do nothing. Anything not asked is not required. For every point, if you have any doubt take bash as a reference.

4. Bonus part

• If the Mandatory part is not perfect don’t even think about bonuses
• &&, || with parenthesis for priorities.
• the wilcard * should work for the current working directory.