将及时命令传递给ssh [英] pipe timely commands to ssh

问题描述

我正在尝试将命令传递给已打开的SSH会话.这些命令将由脚本生成，分析结果，并根据该命令发送下一个命令.

I am trying to pipe commands to an opened SSH session. The commands will be generated by a script, analyzing the results, and sending the next commands in accordance.

我不想将所有命令放在远程主机上的脚本中，而只运行该脚本，因为我也对SSH进程的状态感兴趣:在本地发送命令可以测试"是否SSH连接是否有效，并从SSH进程中获取适当的返回码.

I do not want to put all the commands in a script on the remote host, and just run that script, because I am interested also in the status of the SSH process: sending locally the commands allow to "test" whether the SSH connection is alive or not, and get the appropriate return code from the SSH process.

我尝试了以下方式使用

$ mkfifo /tpm/commands
$ ssh -t remote </tmp/commands

从另一个术语来看:

$ echo "command" >> /tmp/commands

问题:SSH告诉我不会为stdin打开伪tty，并在命令"终止时立即关闭连接.

Problem: SSH tells me that no pseudo-tty will be opened for stdin, and closes the connection as soon as "command" terminates.

我尝试了另一种方法:

$ ssh -t remote <<EOF 
$(echo "command"; while true; do sleep 10; echo "command"; done)
EOF

但是，直到达到EOF为止，所有内容都不会刷新到ssh(对于我来说，是永不).

But then, nothing is flushed to ssh until EOF is reached (in my case, never).

你们有没有解决办法?

推荐答案

在完成操作之前，请停止关闭/tmp/commands.当您关闭管道时，ssh停止读取管道.

Stop closing /tmp/commands before you're done with it. When you close the pipe, ssh stops reading from it.

exec 7> /tmp/commands. # open once
echo foo >&7           # write multiple times
echo bar >&7
exec 7>&-              # close once

您还可以使用 ssh -tt 强制ssh在遥控器上打开tty.

You can additionally use ssh -tt to force ssh to open a tty on the remote.

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