1  /* access.c
   2     This example shows how to test the existence and the R/W/X permissions
   3     of a file. 
   4  */
     
   5  #include <unistd.h>
     
   6  main(int argc, char *argv[])
   7  {
   8     
   9     if (access(argv[1], F_OK) < 0)  {
  10         printf("%s does not exist\n", argv[1]);
  11         exit(1);
  12     }
  13     if (!access(argv[1], R_OK))  
  14         printf("%s has R permission\n", argv[1]);
  15     if (!access(argv[1], W_OK))  
  16         printf("%s has W permission\n", argv[1]);
  17     if (!access(argv[1], X_OK))  
  18         printf("%s has X permission\n", argv[1]);
  19     exit(0);                           
  20  }