sh-lab/todo.org

Testcases:

• [x] trace01.txt - Properly terminate on EOF.
• [x] trace02.txt - Process builtin quit command.
• [x] trace03.txt - Run a foreground job.
• trace04.txt - Run a background job.
• trace05.txt - Process jobs builtin command.
• trace06.txt - Forward SIGINT to foreground job.
• trace07.txt - Forward SIGINT only to foreground job.
• trace08.txt - Forward SIGTSTP only to foreground job.
• trace09.txt - Process bg builtin command
• trace10.txt - Process fg builtin command.
• trace11.txt - Forward SIGINT to every process in foreground process group
• trace12.txt - Forward SIGTSTP to every process in foreground process group
• trace13.txt - Restart every stopped process in process group
• trace14.txt - Simple error handling
• trace15.txt - Putting it all together