echoall : make a hp0 system cp c.hp0 c.c cc -c c.c as -o l.o l40.s as -o m40.o m40.s ld -o unix.new0 -x l.o m40.o c.o ../lib1 ../lib2 nm -ug unix.new0 size unix.new0 : turn a hp0 system into a hp3 system rm -f unix.new3;cp unix.new0 unix.new3 db unix.new3 _rootdev/ 3! _rootdev/ % : protect chmod 0 unix.new[03] chown bin unix.new[03] rm -f *.o a.out c.c >/dev/null