Compile: "gcc -o main main.c" Call: "./main /path/to/some/file/or/directory"

main.c

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

int main (int argc, char** argv) {
  char* path = argv[1];
  printf ("Checking write permissions for %s:\n", path);
  int result = access(path, W_OK);

  printf ("User %s have write permissions.\n", (result == -1 ? "does NOT" : "DOES"));

  return 0;
}