42_Minishell

The objective of this project is to create a shell like BASH.

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.

This minishell:

• Dont interpret unclosed quotes or unspecified special characters.
• 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).
• 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 $.
• Redirections:
  • < redirect input.
  • > redirect output.
  • << read input from the current source until a line containing only the delimiter is seen. it doesn’t need to update history!
  • >> should redirect output with append mode.
• Pipes | The output of each command in the pipeline is connected via a pipe to the input of the next command.
• Environment variables ($ followed by characters) should expand to their values.
• $? should expand to the exit status of the most recently executed foreground pipeline.
• ctrl-C ctrl-D ctrl-\ work like in bash.
• When interactive:
  • ctrl-C print a new prompt on a newline.
  • ctrl-D exit the shell.
  • ctrl-\ do nothing.