#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>

int main ( int argc, char *argv[] )
{
   if ( argc != 2 ) {
      printf("usage: %s filename\n", argv[0]);
      return EXIT_FAILURE;
   }

   // make the file readable on executable by owning user only
   chmod(argv[1], S_IRUSR | S_IXUSR);
   
   return 0;
}