listing 9 shows the same idea executed using a subshell.

because the subshell has so many uses, you might prefer to use it always instead of a combination or the back tick operators.

因为子Shell有许多用途，所以与组合或者反勾号操作符相比，您可能更喜欢使用它。

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by setting errexit, the subshell immediately terminates when the first command stops.

通过设置errexit，子外壳将直接在第一个命令停止时终止。

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finally, we'll add an arbitrary 30-second sleep to ensure the command sequence finishes after the two subshells do.

最后，我们添加任意30秒的休眠时间，确保两个subshell完成之后命令序列完成。

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the use of the brackets ensures the commands are grouped and executed in a subshell.

使用括号是保证此命令分在一个组中，并且在子shell中执行。

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the parentheses effectively execute the statements in a subshell.

圆括号让语句在一个子shell中执行。

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better yet, a subshell can contain another subshell, so expansions can be nested, too.

然而更有价值的是，子Shell可以包含另一个子Shell，所以还可以进行嵌套扩展。

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you can generally do this by running a list of commands in a subshell or by running a list of commands in the current shell.

您一般可以通过在某个Subshell中运行一个命令列表或通过在当前Shell中运行一个命令列表来实现此目的。

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finally, the back quotes both interpret the variable and run the intermediate result as a subshell.

最后，反撇号解释变量并作为子shell运行中间结果。

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the parenthesized series of commands is called a subshell.

命令中带圆括号的部分称为subshell。

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because the subshell is followed by a pipe, all the output of the subshell is sent to the next command in the pipeline.

因为subshell后面跟着管道，所以subshell的所有输出都通过管道传输给了下一个命令。

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here, the subshell command du -sh work | cut -f1 yields the total size of the work directory in a format compatible with pv.

在这里，子shell命令du-shwork|cut-f1以与pv兼容的格式生成工作目录的总大小。

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the series of commands collected in parentheses runs in a subshell and does not affect the state of the current shell.

在圆括号中的系列命令将在一个子Shell中运行，并且不会对当前Shell的状态产生影响。

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the importance of zoomorphism thought cultivating in the martial arts

动物形象思维培养在武术技击演练中的重要作用

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in the english to chinese custom language culture of perspective and the cognition difference zoomorphism compare

英汉习语中的动物形象之文化透视与认知差异比较

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a comparative study of zoomorphism in russian and chinese

俄汉语中表动物词转指人现象之比较

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the zoomorphism decorates the gardens and means luck.

动物形象在园林中起着装饰和寓意吉祥的作用；

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key technology research on the mold of skelp continuous casting machine

管坯连铸机结晶器关键技术研究

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it was very nice to see joop again.

再一次看到Joop我很高兴。

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the 33-year-old bride wore a dress designed by wolfgang joop, and a diamond tiara belonging to her family.

33岁的新娘穿着由沃夫冈·乔普（WolfgangJoop）设计的礼服，头戴一件家族祖传的钻石头饰。

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neither obsession or joop were a favorite. they may have been a quick buy from his security guards because bav was not always easy to find.

Obsession和Joop都不是他的最爱。他也许会让保安买一些，因为BAV不是那么容易找到的

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