单词subshell
n.: 【核】支壳层
网络: 子外壳；亚壳层；次层
【原子能】支壳层
副壳
次层
亚壳层
复数：subshells
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。
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。
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。
The parenthesized series of commands is called a subshell.
命令中带圆括号的部分称为subshell。
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。
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。
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。
The parentheses effectively execute the statements in a subshell.
圆括号让语句在一个子shell中执行。
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。
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。