bash脚本并行ssh远程命令 [英] bash script parallel ssh remote command

问题描述

我有一个脚本，该脚本通过ssh连接在多台不同的计算机上触发远程命令.脚本如下所示:

i have a script that fires remote commands on several different machines through ssh connection. Script goes something like:

for server in list; do
echo "output from $server"
ssh to server execute some command
done

问题显然是时间，因为它需要建立ssh连接，启动命令，等待答案，打印出来.我想要的是一个脚本，该脚本将尝试一次建立所有连接，并在得到脚本后立即返回echo"$ server的输出"和命令的输出，因此按列表顺序是不必要的.

The problem with this is evidently the time, as it needs to establish ssh connection, fire command, wait for answer, print it. What i would like is to have script that would try to establish connections all at once and return echo "output from $server" and output of command as soon as it gets it, so not necessary in the list order.

我已经搜索了一段时间，但没有找到答案.我无法在命令作为一个线程建议运行后取消ssh会话，因为我需要输出，并且不能在其他线程中使用建议的并行gnu.另外，我不能使用任何其他工具，也不能在此计算机上安装任何东西，只有可用的工具是GNU bash，版本4.1.2(1)-发行.

I've been googling this for a while but didn't find an answer. I cannot cancel ssh session after command run as one thread suggested, because i need an output and i cannot use parallel gnu suggested in other threads. Also i cannot use any other tool, i cannot bring/install anything on this machine, only useable tool is GNU bash, version 4.1.2(1)-release.

另一个问题是，像这样的ssh会话如何受到限制?如果我只是粘贴5条左右的"ssh connect，执行某些命令"行，则实际上什么也没做，或者仅从列表中的第一条执行. (如果我粘贴3-4行，则可以使用).谢谢

Another question is how are ssh sessions like this limited? If i simply paste 5+ or so lines of "ssh connect, do some command" it actually doesn't do anything, or execute only on first from list. (it works if i paste 3-4 lines). Thank you

推荐答案

您尝试过吗?

for server in list; do
  ssh user@server "command" &
done
wait
echo finished

更新:启动子shell:

Update: Start subshells:

for server in list; do
  (echo "output from $server"; ssh user@server "command"; echo End $server) &
done
wait
echo All subshells finished

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