HW12
COP-3402

1. Why doesn't a program have to open the standard in file?
2. What files comprise standard I/O?
3. Write a bash command that uses ls -l and grep to find lines matching "rw" as a single pipeline.
4. Write a snippet of code creates a pipe between two processes that redirects the first on's standard out to the second one's standard in. Use any programs you like.