A small shell like bash with pure C++,based on flex, bison and readline.
Support:
- external cmd.
- internal cmd: cd,exit,job,kill,echo,exec.
- pipeline/redirection.
- multicmd per line. separated by ';'.
- background task. with '&'
- simple task management: job kill
- ctrl+c interrupt foreground task.
- 'exit' exit the Yinsh.