#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main (int argc, char **argv) {
    int pid;
    if (argc == 1) {
        fprintf(stderr, "usage: %s <prog> <arg> ...\n", argv[0]);
        return -1;
    }
    pid = fork();
    if (!pid) {
        char *a[argc];
        int i;
        for (i=0; i<(argc-1); i++){
            a[i] = argv[i+1];
        }
        a[i] = 0;
        execvp(a[0], a);
        fprintf(stderr, "%s: can't execute %s\n", argv[0], a[0]);
    }
    return 0;
}