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|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|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|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.

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.

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。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

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...

问在BASH命令中使用变量？
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在BASH命令中使用变量？EN