a4 plot:

 ./p1 | dash plot.sh > p1.gif

 ./p1 | tee p1.out | dash plot.sh > p1.gif

 ./p2 < p1.out | dash plot.sh > p2.gif

 dash plot.sh < anydatafile > x.gif

---

randomly assigning functions:

 shuf a5functions.list | head -n 1

 shuf a5functions.list | tail -n 1

 paste a5functions.list students.list

 shuf a5functions.list | paste students.list -

 (cat a5functions.list a5functions.list) | shuf | paste students.list -

---

Linux:

 typedef void (*sighandler_t)(int);

 sighandler_t signal(int signum, sighandler_t handler);

standard C:

void ( *signal(int signum, void (*handler)(int)) ) (int);

void ( *signal(
               int signum, void (*handler)(int)
              )
     ) (int);

---

123 * 45

	1 2 3
    *     4 5
--------------
	    15 = 10 + 5
          1 5