Finished Batch + Minor improvements

include/cmd/cmd_head.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "cmd/cmd_base.hpp"
+
+namespace fsh {
+
+    class CmdHead : public Command {
+
+      protected:
+        virtual void register_flags() override {
+            ArgFactory& factory = get_factory();
+            factory.add_rule<int>((std::string) "-n", true);
+            factory.add_input_rule();
+        }
+
+        virtual void run(std::istream& in, std::ostream& out, ArgManager& args) override {
+            std::string s;
+            std::string o;
+
+            int count = args.get<int>("-n").value();
+            while (std::getline(in, s)) { 
+                if(count-- < 1) break;
+                o += s + "\n"; 
+            }
+            out << o;
+        }
+    };
+
+}