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fix #50
ターミナルでのコマンドの実行時、カーソルの移動後コマンド本体の実行開始前にターミナルを再描画します。
これにより、
cat
コマンド、hex2bin
コマンド、large
コマンド (いずれも引数なし) などの実行時、Enterキーを押しても画面が変わらず、入力が効いていないという誤解を発生させるのを防ぎます。
この誤解により、
cat
コマンドの実行時余計にEnterキーを押してしまい、余計な改行が入ることを誘発する、などの害が考えられます。