flags = [ Option ['e'] [] (NoArg Encrypt) "encryption"
        , Option ['d'] [] (NoArg Decrypt) "decription"
        , Option ['k'] [] (ReqArg Key "KEY") "key"
        ]
flags = [ Option ['e'] [] (NoArg Encrypt) "encryption"
        , Option ['d'] [] (NoArg Decrypt) "decription"
        , Option ['k'] [] (ReqArg Key "KEY") "key"
        ]
flags = [ Option ['e'] [] (NoArg Encrypt) "encryption"
        , Option ['d'] [] (NoArg Decrypt) "decription"
        , Option ['k'] [] (ReqArg Key "KEY") "key"
        ]