$lsfirst-example first-example.c new-sum.c sum.c$gcc sum.c -o sum$cat sum.c #include <stdio.h>#include <stdlib.h>void printhelp(char progname[]); int main(int argc, char *argv[]){int i;int sum = 0; /* Simple sanity check */if (argc == 1){printhelp(argv[0]);return 1;} for (i=1; i<argc; i++){sum = sum + atoi(argv[i]);}printf(“Total sum: %i\n”, sum);return 0;} void printhelp(char progname[]){printf(“%s integer …\n”, progname);printf(“This program takes any number of ” …