1. #include 2. #include <stdio.h> 3. #include <unistd.h> 4. #include <sys/wait.h> 5. #include <string.h> 6. #include <stdlib.h> 7. 8. void execute(char *user_input) 9. { 10. printf("Entered execute successfully\n"); 11. pid_t pid; 12. int state_loc; 13. if( (...