diff --git a/src/Makefile b/src/Makefile
index bf8a082..9c0ae3d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -8,4 +8,4 @@ main: $(OBJFILES)
 	$(CC) hexdump.c -o hexdump
 
 test: main
-	./hexdump
+	./hexdump ../tests/test2.bin
diff --git a/src/hexdump.c b/src/hexdump.c
index 85baed1..919e14c 100644
--- a/src/hexdump.c
+++ b/src/hexdump.c
@@ -50,7 +50,6 @@ int hexdump(char *data) {
 		}
 		if (dumpgroup == 2) {
 			dumpgroup = 0;
-			cur_start_of_line = 0;
 			chardump(data, cur_start_of_line, i);
 			hexnum = 0;
 			cur_start_of_line = i;
@@ -58,14 +57,18 @@ int hexdump(char *data) {
 	}
 }
 
-int main() {
-	FILE *infile = fopen("../tests/test2.bin", "r");//fopen("test.bin", "r");
+int main(int argc, char *argv[]) {
+	if (argc < 2) {
+		printf("%s: not enought arguments\n", argv[0]);
+		return 1;
+	}
+	FILE *infile = fopen(argv[1], "r");
 	char data[10000]; // FIXME
 	char ch;
 	int byte = 0; // FIXME
 	if (infile == NULL) {
 		printf("Cannot find file: \n");
-		return 0;
+		return 1;
 	}
 	while ((ch = fgetc(infile)) != EOF)
         {
diff --git a/tests/test4.bin b/tests/test4.bin
new file mode 100644
index 0000000..9982bf7
--- /dev/null
+++ b/tests/test4.bin
@@ -0,0 +1,22 @@
+LONG file
+LONG file
+LONG file
+LONG file
+LONG file
+LONG file
+LONG file
+LONG file
+LONG file
+LONG file
+LONG file
+123
+456
+123
+123
+123
+123
+456
+456
+456
+456
+