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Why does interaction with 3000shell often gets messed up when running programs in the background with &? What system calls are used to list all

Why does interaction with 3000shell often gets "messed up" when running programs in the background with &?

What system calls are used to list all the files in a directory? What are the library calls that are normally used to make those system calls?

What happens when you delete line 293 (the call to wait())? Why?

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