all:	crypto pipe sequence cryptop
crypto:	crypto.c 
	cc -o crypto crypto.c 
	echo "crypto uses a semi-co-routine"
cryptop:	cryptop.c 
	cc -o cryptop cryptop.c 
	echo "cryptop uses a C pipe and fork"
pipe:	p1 p2
	echo "p1|p2" >pipe
	chmod a+x pipe
	echo "pipe uses a Shell pipe"
sequence:	p1 p2
	echo "p1 >pipe.dat; p2 <pipe.dat" >sequence
	chmod a+x sequence
	echo "sequence uses a semicolon and an extra file"
p1:	p1.c
	cc -o p1 p1.c
	echo "p1 is the first part of the crypto program"
p2:	p2.c
	cc -o p2 p2.c
	echo "p2 is the second part of the crypto program"
clean:	
	rm crypto p1 p2 pipe sequence pipe.dat