ADD file via upload

b/2/echo.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char **argv)
+{
+	if (argc == 1)
+		return EXIT_FAILURE;
+
+	write(1, argv[1], strlen(argv[1]));
+	return EXIT_SUCCESS;
+}