"added system path execution"

main.go

@@ -154,7 +154,18 @@ func gosh_process_input(sh *types.Shell, input string) {
 		default:
 
 			if !check_pathes(sh, parts[0], parts[1:]) {
-				fmt.Println("Unknown command:", parts[0])
+
+				comd := exec.Command(parts[0], parts[1:]...)
+
+				out, err := comd.Output()
+
+				if err != nil {
+					fmt.Print("Error: ")
+					color.Red(err.Error())
+					return
+				}
+
+				fmt.Println(string(out))
 				return
 			}
 		}