Minishell

As beautiful as a shell. Creating our own little bash.

Exploring process creation and synchronisation. Executing a command inside a shell implies creating a new process, which execution and final state will be monitored by its parent’s process.

Usage

• Git clone the repository
• cd into directory and run make

./minishell

Main project instructions

• Show a prompt when waiting for a new command.
• Search and launch the right executable (based on the PATH variable or by using relative or absolute path) like in bash.
• It must implement the builtins like in bash:
  • echo with option ’-n’.
  • cd with only a relative or absolute path.
  • pwd without any options.
  • export without any options.
  • unset without any options.
  • env without any options and any arguments.
  • exit without any options
• Parsing
  • ; in the command should separate commands like in bash.
  • ’ and " should work like in bash except for multiline commands.
• Redirection
  • Redirections < > “>>” should work like in bash except for file descriptor aggregation.
  • Pipes | should work like in bash except for multiline commands.
• Expansion
  • Environment variables ($ followed by characters) should work like in bash.
  • $? should work like in bash.
• Signals
  • ctrl-C, ctrl-D and ctrl-\ should have the same result as in bash.
• Termcaps
  • Use up and down arrows to navigate through the command history.
  • Move cursor left and right using arrows.
  • Move to the beginning and end using HOME and END keys.