如何在erl中为单个标志设置多个命令行参数

Question

在Erlang中，

我们可以通过命令行参数将多个输入传递给Erlang系统。

  

erl -sname name1 -setcookie abcd

如何为单个标志传递多个值？

Answer 1

我们可以将多个值发送到单个标志。

值由空格字符

区分

erl -key1 val1 val2 val3
Erlang/OTP 17 [erts-6.3] [source] [64-bit] [smp:2:2] [async-threads:10] [kernel-poll:false]

Eshell V6.3  (abort with ^G)
1> init:get_argument(key1).
{ok,[["val1","val2","val3"]]}

您可以传递多个键值对，例如

erl -key1 val1 val2 val3 -key2 val11 val12 val13
Erlang/OTP 17 [erts-6.3] [source] [64-bit] [smp:2:2] [async-threads:10] [kernel-poll:false]

Eshell V6.3  (abort with ^G)
1> init:get_argument(key2).
{ok,[["val11","val12","val13"]]}
2> init:get_argument(key1).
{ok,[["val1","val2","val3"]]}

如果您多次传递密钥，则会得到类似的值

 erl -key1 val1 val2 val3 -key1 val11 val12 val13
 Erlang/OTP 17 [erts-6.3] [source] [64-bit] [smp:2:2] [async-threads:10] [kernel-poll:false]

 Eshell V6.3  (abort with ^G)
 1> init:get_argument(key1).
 {ok,[["val1","val2","val3"],["val11","val12","val13"]]}
 2>

Answer 2

您可以在Erlang文档here中了解有关处理命令行参数的更多信息。