in Spring 2012 I've been asked to develop a simple shell coded in the C language.
This shell is capable of rather deep job control, it is indeed capable of starting several jobs, piping commands from one job to another. extensively modifying the environment is also fully supported and passed to started process. backgrounding and foregrounding process is also a possibility. As in any well known shell, the user can stop a process with ctrl+z and run it again either in background or in foreground.
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