#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
 pid_t childpid;
 int status, exit_code, x;
 exit_code = EXIT_SUCCESS;
 if (argc < 2) {
    printf(“Usage: %s command args\n“, argv[0]);
    exit_code = EXIT_FAILURE;
    }else{
        switch (childpid = fork()){
            case -1:
                perror("Could not fork\n");
                exit_code = EXIT_FAILURE;
                break;
            case 0:
                if (execvp(argv[1], &argv[1]) < 0){
                    perror(“Could not execute the command\n”);
                    exit_code = EXIT_FAILURE;
                    break;
                } default:
                    if ((x = wait(&status)) != childpid) {
                        perror(“Wait interrupted by a signal\n”);
                        exit_code = EXIT_FAILURE;
                    }
            } // end switch
        } // end else
    exit(exit_code);
} // end main