parameter is optional, defaults to '.'

shperm.c

@@ -121,15 +121,22 @@ void dumpLines() {
 }
 
 int main(int argc, char* argv[]) {
-    if (argc != 2) {
+    if (argc > 2) {
-        fprintf(stderr, "Usage: %s <file or directory>\n", argv[0]);
+        fprintf(stderr, "Usage: %s [file or directory]\n", argv[0]);
         exit(1);
     }
 
     char* path;
+    char* startpath;
     path = malloc(PATH_MAX);
+
+    if (argc == 1) {
+    	startpath = ".";
+    } else {
+    	startpath = argv[1];
+    }
     
-    if (realpath(argv[1], path)) {
+    if (realpath(startpath, path)) {
         char* base;
         do {
             struct stat sb;
@@ -151,4 +158,4 @@ int main(int argc, char* argv[]) {
     }
 
     free(path);
-}
+}