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char *pathbuf;
size_t n;

if (clearenv() != 0) {
  /* Handle error */
}


n = confstr(_CS_PATH, NULL, 0);
if (n == 0) {
  /* Handle error */
}

if ((pathbuf = malloc(n)) == NULL) {
  /* Handle error */
}

if (confstr(_CS_PATH, pathbuf, n) == 0) {
  /* Handle error */
}

if (setenv("PATH", pathbuf, 1) == -1) {
  /* Handle error */
}

if (setenv("IFS", " \t\n", 1) == -1) {
  /* Handle error */
}

if (system("ls dir.`date +%Y%m%d`") == -1) {
  /* Handle error */
}