argv_assemble
command = argv_assemble(ac, av);
command = argv_assemble(ac, av);
char *argv_assemble(int, char **argv);
arg = argv_assemble(1, &arg); /* quote command correctly */
arg2 = argv_assemble(ac, av); /* rest of command */
args = argv_assemble(ac, av); /* logged later */
command = argv_assemble(ac, av);
args = argv_assemble(ac, av); /* logged later */