blocks|key|2255455|text|如果机器有很好的编号，如您的示例中所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2255456|for+i+in+{1..20}+;+do+ssh+machine$i+cat+log.txt;+done|code-block|syntax|javascript|2255457|如果文件中有计算机列表，则可以使用：|2255458|cat+machinesList.txt+%7C+xargs+-i+ssh+{}+cat+log.txt|2255459|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

If the machines are nicely numbered like in your example:

<pre><code>for i in {1..20} ; do ssh machine$i cat log.txt; done
</code></pre>

If you have the list of machines in a file, you can use:

<pre><code>cat machinesList.txt | xargs -i ssh {} cat log.txt
</code></pre>

blocks|key|2614561|text|您可以将所有计算机名称存储在一个数组或文本文件中，并循环遍历它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2614562|declare+-a+machineList=('host1'+'host2'+'otherHost')+#+and+more...


for+machine+in+${machineList[@]}
do
++++ssh+$machine+cat+log.txt
done|code-block|syntax|javascript|2614563|我想你的机器不是真的命名为机器1，机器2，等等。|2614564|一些链接：|2614565|bash教程|unordered-list-item|offset|length|2614566|GNU+Bash+Array文档|2614567|entityMap|0|LINK|mutability|MUTABLE|url|http://www.thegeekstuff.com/2010/06/bash-array-tutorial/|1|http://www.gnu.org/software/bash/manual/html_node/Arrays.html^0|0|0|0|0|0|6|0|0|0|G|1|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|13|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|14|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|15|8|@]|9|@$N|16|O|17|1|18]]|A|$]]|$1|P|3|Q|5|M|7|19|8|@]|9|@$N|1A|O|1B|1|1C]]|A|$]]|$1|R|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]|Z|$5|U|V|W|A|$X|10]]]]

You could store all your machine names in an array or text file, and loop through it.

<pre><code>declare -a machineList=('host1' 'host2' 'otherHost') # and more...


for machine in ${machineList[@]}
do
 ssh $machine cat log.txt
done
</code></pre>

I assume your machines aren't literally named 'machine1', 'machine2', etc.

Some links:

<ul>
<li><a href="http://www.thegeekstuff.com/2010/06/bash-array-tutorial/" rel="nofollow">bash Array Tutorial</a></li>
<li><a href="http://www.gnu.org/software/bash/manual/html_node/Arrays.html" rel="nofollow">GNU Bash Array Documentation</a></li>
</ul>

blocks|key|2614498|text|for+i+in+{1..20}
do
+++ssh+machine$i+cat+log.txt
done|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2614499|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>for i in {1..20}
do
 ssh machine$i cat log.txt
done
</code></pre>

blocks|key|2255507|text|使用循环播放|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2255508|for+i+in+{1..20}
do
+++ssh+machine$i+cat+log.txt
done|code-block|syntax|javascript|2255509|但是请注意，您正在远程shell会话中运行cat，而不是当前会话，因此这可能不太像您预期的那样工作。试试看。|style|CODE|2255510|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cyberciti.biz/faq/bash-for-loop/^0|2|4|0|0|0|L|3|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Use a <a href="http://www.cyberciti.biz/faq/bash-for-loop/" rel="nofollow">loop</a>?

<pre><code>for i in {1..20}
do
 ssh machine$i cat log.txt
done
</code></pre>

But note that you're running <code>cat</code> within a remote shell session, not the current one, so this might not quite work as you expect. Try it and see.

blocks|key|1058241|text|将主机放入文件中，并使用file循环，如下所示。注意-n标志在ssh上的使用|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1058242|while+read+host;+do+ssh+-n+$host+cat+log.txt;+done+<+hosts-file|code-block|syntax|javascript|1058243|或者，您可以使用PSSH|1058244|pssh+-h+hosts-file+-i+"cat+log.txt"|1058245|entityMap|0|LINK|mutability|MUTABLE|url|http://freshmeat.net/projects/pssh/^0|Q|2|V|3|0|0|8|4|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|M|3|N|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

Put your hosts in a file and use a while loop as shown below. Note the use of the <code>-n</code> flag on <code>ssh</code>:

<pre><code>while read host; do ssh -n $host cat log.txt; done &lt; hosts-file
</code></pre>

Alternatively you can use <a href="http://freshmeat.net/projects/pssh/" rel="nofollow">PSSH</a>:

<pre><code>pssh -h hosts-file -i "cat log.txt"
</code></pre>

blocks|key|1058255|text|我建议使用一个名为什穆克斯的程序。尽管它的名字很好，但效果很好。我用过100多台机器，效果很好。它还优雅地为您处理机器故障，这可能是bashfor循环方法的一个缺点。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1058256|我认为这个程序最酷的地方是能够为您的命令发出多个线程，这允许在所有20台机器上并行运行这些命令。|1058257|entityMap|0|LINK|mutability|MUTABLE|url|http://web.taranis.org/shmux/^0|9|4|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I would recommend using a program called <a href="http://web.taranis.org/shmux/" rel="nofollow">Shmux</a>. Despite the name, it works really well. I've used it with more than 100 machines with good results. It also gracefully handles machine failures for you which could be a disadvantage with a bash for loop approach. 

I think the coolest thing about this program is the ability to issue multiple threads for your commands which allows to run the commands on all 20 machines in parallel.

blocks|key|1058229|text|除了使用循环的建议之外，您可能还想看看为在多个客户端上运行命令而设计的工具，如pssh或dsh。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1058230|entityMap|0|LINK|mutability|MUTABLE|url|http://code.google.com/p/parallel-ssh/|1|http://www.netfort.gr.jp/~dancer/software/dsh.html^0|13|4|0|18|3|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Aside from the suggestions for using a loop, you might want to take a look at tools, like <a href="http://code.google.com/p/parallel-ssh/" rel="nofollow">pssh</a> or <a href="http://www.netfort.gr.jp/~dancer/software/dsh.html" rel="nofollow">dsh</a>, designed for running commands on multiple clients.

I have 20 machines, each running a process. The machines are named:

<blockquote>
 ["machine1", "machine2", ...., "machine20"]
</blockquote>

To inspect how the process is doing on <code>machine1</code>, I issue the following command from a remote machine:

<pre><code>ssh machine1 cat log.txt
</code></pre>

For <code>machine2</code>, I issue the following command:

<pre><code>ssh machine2 cat log.txt
</code></pre>

Similarly, for <code>machine20</code>, I issue the following command:

<pre><code>ssh machine20 cat log.txt
</code></pre>

<hr>

Is there a bash command that will allow me to view the output from all machines using one command?

using a variable in a BASH command?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有20台机器，每台运行一个进程。这些机器的名称是："machine1“、"machine2”、.、"machine20“为了检查进程在machine1上的运行情况，我从远程计算机发出以下命令：ssh machine1 cat log.txt对于machine2，我发出以下命令：ssh machine2 cat log.txt同样，对于machine20，我发出以下命令：ssh machine20

问在BASH命令中使用变量？
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