This is achieved by checking whether the corresponding variable has been set and adding the option to the command line.
这是通过检查对应的变量是否已设置并将该选项添加到命令行来实现的。
The short form string should include each valid option letter, followed by a colon (:) to indicate that the command line option should be followed by a value.
短形式字符串应该包含每个有效的选项字母，每个字母后面是一个冒号 (:)，这表示命令行选项后面应该是一个值。
The -H option dereferences links on the command line and the -L option dereferences those plus links that are part of the display.
H选项取消引用命令行上的链接，而-L 选项取消引用属于显示内容一部分的附加链接。
For example, in the code above we used -d "for the command line option defining a name-value pair."
比方说，在上面的代码中我们用“- D”这一命令行选项来定义名-值对。
Publicly, Israel has stuck to its well-worn line that no option should be ruled out.
在公开场合，以色列坚持不排除任何选项的老路线。
Consider the situation where you might want to have a command line option (for example, to enable debugging) that doesn't require a value.
考虑一下某个命令行选项不需要值的情况(例如启用调试的选项)。
Remember that the getopt library routine is general in nature, and not every command line option is expected to have an associated value.
请记住，getopt库例程本质上是通用的，而且并非每个命令行选项都有相关联的值。
To fix this behavior, activate the framework's unittest plug-in, either in your project's conttest.py file, or by using the -p command line option.
为了纠正这种行为，可以在项目的conttest . py文件中或使用- p命令行选项激活框架的unittest插件。
If one of the required values is None, this means that one of the command line option was not specified.
如果必需的值之一是None，就意味着没有指定一个命令行选项。
To specify the actual standard that GCC uses, you can use the -std option from the command line.
可以在命令行上使用 -std选项指定GCC使用的实际标准。
Use the -s command line option with ccache to get statistics about the cache performance (see Listing 3).
在ccache中使用- s命令行选项来获得关于高速缓存性能的统计数据(见清单3)。
To set the name when using Erlang from the command line you can use the sname command line option (see Listing 3).
为了在使用Erlang时通过命令行设置名称，您可以使用sname命令行选项(请参见清单3)。
This effectively increases the number of simultaneous compilations that can occur, just as if you had used the multiple jobs option with make (with the -j command line option).
只需要为make添加多任务选项(使用-j命令行选项)，它就可以有效地提高同步编译的数目。
The -t option displays a total line, and the -s option along with a value refreshes the info with the frequency specified.
t选项显示整个行，带一个值的-s选项以指定的频率刷新信息。
Finally, to associate all the input parameters with the same command option, you add the command-line option to the positional_options_description object with value -1. Here's the code.
最后，若要将所有的输入参数与同一个命令行选项相关联，您需要使用值- 1将该命令行选项添加到positional_options_description对象。
Since the -debug command line option is specified, you'll see some startup messages that were directed to stdout.
由于已经指定了-debug命令行参数，您将会看到定向到标准输出的一些启动消息。
The -verbose: gc command-line option produces trace data containing gc statistics including the heap occupancy.
gc命令行选项生成包含gc统计数据(包括堆占用情况)的跟踪数据。
To get the information in 1k blocks, use the -k command-line option, as shown in Listing 2.
要获得以1k块为单位的信息，可以使用- k命令行选项，如清单2所示。
The multi-line option can allow you to create more precise patterns for some tasks.
多行选项允许您为某些任务创建更精确的模式。
A command-line option is provided to minimize the output record to only display the EWU value for each character string provided on the command line.
一个命令行选项可以缩减输出记录，只显示在命令行上提供的每个字符串的ewu值。
If you want to configure the quota for multiple users, first set the quota for a single user, then use the -p command-line option to edquota.
如果您需要对多个用户配置配额，那么可以首先为一个用户设置配额，然后对edquota使用- p命令行选项。
If something was wrong, it returns an error code that is documented under the verify option for the command-line tool.
如果有地方出了问题，则返回一个错误代码，该代码被记录在命令行工具的verify选项下。
To read back the information from the file, use the -i command-line option to specify the input source.
要从文件中读取这些信息，可以使用- i命令行选项，以指定输入源文件。
On some systems, there is also a quicker format available using the -q command-line option, as shown here in Listing 2.
在某些系统中，还可以使用- q命令行选项，以提供一种更快捷的格式，如清单2中所示。
When starting up the VM, specify the location of the password file to use with the following command-line option
在启动虚拟机时，用以下命令行选项指定要使用的口令文件的位置
To resize the image with convert, just use the -sample command-line option.
要用convert调整图像的大小，只要使用- sample命令行选项。
The internal flight recorder uses a command-line option like this one
内部的动态记录器使用一个命令行选项
Some systems do not have this option but do have the -x command-line option, which only includes the file usage for files on the same device or file system as the path you specify.
有些系统没有这个选项，但是有- x命令行选项，该选项仅包含与您所指定的路径相同的设备或文件系统中的文件使用情况。
As in Listing 4, you can also specify the -k command-line option to force the script to continue even if some errors are detected during xsltproc processing.
与清单4类似，也可以指定- k命令行选项来强制脚本继续，即便在xsltproc处理中检测到错误也是如此。
Adding the following command-line option to the application produces a system dump when the Example.trigger method is called.
将下面的命令行选项添加到应用程序上会在Example. trigger方法被调用时产生一个系统转储文件。
应用推荐