################CS:APP Shell Lab################Files:Makefile	# Compiles your shell program and runs the testsREADME		# This filetsh.c		# The shell program that you will write and hand intshref		# The reference shell binary.# The remaining files are used to test your shellsdriver.pl	# The trace-driven shell drivertrace*.txt	# The 20 trace files that control the shell drivertshref.out 	# Example output of the reference shell on all 20 traces# Little C programs that are called by the trace filesmyspin.c	# Takes argument <n> and spins for <n> secondsmysplit.c	# Forks a child that spins for <n> secondsmystop.c        # Spins for <n> seconds and sends SIGTSTP to itselfmyint.c         # Spins for <n> seconds and sends SIGINT to itselfmyrw.c		# Reads from STDIN and writes to STDOUT