guimartinelli / 42_minishell Goto Github PK

This is the 8th École 42 project, and is about creating a simple shell, where we learn a lot about Shell, processes, UNIX and file descriptors, debbuging, hash tables, lexical analysis and much more.
Also this is the first e42 project that requires group work, so we learn a lot about mob programming, documentation, git tools like working on different branches and task management as well.

The project requires your Shell to:

• Display a prompt when waiting for a new command.
• Have a working history.
• Search and launch the right executable (based on the PATH variable or using a
  relative or an absolute path).
• Not use more than one global variable.
• Not interpret unclosed quotes or special characters which are not required by the
  subject such as \ (backslash) or ; (semicolon).
• Handle ’ (single quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence.
• Handle " (double quote) which should prevent the shell from interpreting the metacharacters in the quoted sequence except for $ (dollar sign).
• Implement redirections:
  • '<' should redirect input.
  • '>' should redirect output.
  • '<<' should be given a delimiter, then read the input until a line containing the delimiter is seen. However, it doesn’t have to update the history!
  • '>>' should redirect output in append mode.
• Implement pipes. The output of each command in the pipeline is connected to the input of the next command via a pipe.
• Handle environment variables ($ followed by a sequence of characters) which should expand to their values.
• Handle $? which should expand to the exit status of the most recently executed foreground pipeline.
• Handle ctrl-C, ctrl-D and ctrl-\ which should behave like in bash.
• In interactive mode:
  • ctrl-C displays a new prompt on a new line.
  • ctrl-D exits the shell.
  • ctrl-\ does nothing.
• Must implement the following 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

Install Readline library with

$ sudo apt-get install libreadline-dev

Compile the program make
You're ready to run it, have fun!! ./minishell

prmarquesz
GuiMartinelli