Question

我试图处理用户在执行指挥时提出的许多论点。至今,我一直在试图限制我的文字设计,以管理我很容易与Getopt打交道的旗帜:

GetOptions ("a" => $a, "b" => $b);

这样,我就可以检查一下,是否指定了一种或一种b,然后执行各自的法典/职能。

然而,现在我有这样的情况,即用户可以具体说明以下两个论点变量:

command -a black -b white

这是罚款,但我无法找到一种很好的方法来确定——a或——b是首先确定的。因此,我不知道,在我执行过<条码>后,论点变量是否被分配到<条码>。

我怎么能说明与<代码>-a有关的哪些变量,以及上述例子中哪些变量与-b有关?

Answer 1

选择支持各种选择,例如:

GetOptions(  a=s  => $a,  b=s  => $b);
print "a is $a and b is $b";

a. 与贵问题印刷中的指挥线一致:

a is black and b is white

See manual page , forton more options. 这是一个非常强大的单元。

Answer 2

my $a =   ; # option variable with default value (false)
my $b =   ; # option variable with default value (false)

GetOptions ( a  => $a,  b  => $b);

print "a is $a and b is $b

请通过 Getopt:Long。从这里看。

The call to GetOptions() parses the command line arguments that are present in @ARGV and sets the option variable to the value 1 if the option did occur on the command line. Otherwise, the option variable is not touched. Setting the option value to true is often called enabling the option.

The option name as specified to the GetOptions() function is called the option specification. Later we ll see that this specification can contain more than just the option name. The reference to the variable is called the option destination.

GetOptions() will return a true value if the command line could be processed successfully. Otherwise, it will write error messages to STDERR, and return a false result.

也可以帮助你们。

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