bash 将多个命令管道化为一个命令
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原文地址: http://stackoverflow.com/questions/11917708/
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Pipe multiple commands into a single command
提问by Rob Bednark
How can I pipe the stdout of multiple commands to a single command?
如何将多个命令的标准输出通过管道传输到单个命令？
Example 1: combine and sort the output of all three echo commands:
示例 1：对所有三个 echo 命令的输出进行组合和排序：
echo zzz; echo aaa; echo kkk
desired output:
所需的输出：
aaa
kkk
zzz
Example 2: rewrite the following so that all the commands are in a single command-line using pipes, without redirects to a temp file:
示例 2：重写以下内容，以便所有命令都在使用管道的单个命令行中，而不重定向到临时文件：
setopt > /tmp/foo; unsetopt >> /tmp/foo; set >> /tmp/foo; sort /tmp/foo
回答by Rob Bednark
Use parentheses ()'s to combine the commands into a single process, which will concatenate the stdout of each of them.
使用括号 () 将命令组合成一个进程，这将连接每个命令的标准输出。
Example 1 (note that $is the shell prompt):
示例 1（注意$是 shell 提示）：
$ (echo zzz; echo aaa; echo kkk) | sort
aaa
kkk
zzz
Example 2:
示例 2：
(setopt; unsetopt; set) | sort
回答by codeforester
You can use {}for this and eliminate the need for a sub-shell as in (list), like so:
您可以使用{}它并消除对子 shell 的需要(list)，如下所示：
{ echo zzz; echo aaa; echo kkk; } | sort
We do need a whitespace character after {and before }. We also need the last ;when the sequence is written on a single line.
我们确实需要在 之后{和之前有一个空格字符}。;当序列写在一行上时，我们还需要最后一个。
We could also write it on multiple lines without the need for any ;:
我们也可以将它写在多行上，而无需任何;：
Example 1:
示例 1：
{
echo zzz
echo aaa
echo kkk
} | sort
Example 2:
示例 2：
{
setopt
unsetopt
set
} | sort
回答by Claudio
In Windows it would be as follow: (echo zzz & echo aaa & echo kkk) | sort
在 Windows 中，它将如下所示： (echo zzz & echo aaa & echo kkk) | sort
Or if it is inside a batch file it can be mono line (like sample) as well as multiline:
或者如果它在批处理文件中，它可以是单行（如样本）以及多行：
(
echo zzz
echo aaa
echo kkk
) | sort
Note: The original post does not mention it is only for Linux, so I added the solution for Windows command line... it is very useful when working with VHD/VHDX with diskpart inside scripts (echo diskpart_command) instead of the echo on the same, but let there the echo, there is also another way without echos and with >redirector, but it is very prone to errors and much more complex to write (why use a complicated prone to errors way if exists a simple way that allways work well)... also remember %d%gives you the actual path (very useful for not hardcoding the path of VHD/VHDX files).
注意：原帖没有提到它仅适用于 Linux，所以我添加了 Windows 命令行的解决方案......当使用 VHD/VHDX 与脚本中的 diskpart（echo diskpart_command）而不是相同的 echo时，它非常有用，但是echo，还有另一种没有回声和>重定向器的方法，但它很容易出错，而且编写起来要复杂得多（如果存在一种始终运行良好的简单方法，为什么要使用复杂的容易出错的方法）。 . 还记得%d%为您提供实际路径（对于不硬编码 VHD/VHDX 文件的路径非常有用）。
