在bash中的ssh上运行本地计算机上的命令

Question

I want to run a command on local system while I have ssh'd to a remote system in bash. Is there a way to do this? This is what I want:

#!/bin/bash

ssh mysystem@ip <<'SSH'
#Do something
#Run a command here on local machine and not on machine I have sshed to
#Do Something

exit
SSH

Edit: I want to echo some message and since echo command output won't show from remote machine, I want to run from local.

Answer 1

WHen you are using SSH, the key sequence <enter>~ is a escape prefix that allows you to pause SSH and send key sequences to the ssh client on the host-side. The sequence <enter>~<ctrl + z> will pause (stop) the ssh-client job and drop you to a prompt in the calling system. Typing fg (if ou are on a Unix shell) will resume your ssh session afterwards.

You can see other ssh escape sequences avaiable by typing <enter>~? . The sequence <enter>~. will terminate the connection and is very handy when your session is locked on the remote machine.

(Users with non-US keyboard layouts that use ~ as a dead-key to compose accents and digrams have, obviously, to type ~ twice in all of these sequences)

These sequences are of use from when you are operating the SSH session an d typign commands yourself, not for scripting.

Since you seem to want a way to that in scripts, the straightforward solution is to include an ssh command back to the originating host.

Answer 2

If you can change the script, you can use an expect script for that - expect_example_and_tips

This allows you to start an "ssh process" to which can send commands to the remote machine, while still running on the local machine.

Much easier in python though in my opinion - example:

#!/usr/bin/env python

import pexpect

PROMPT = "\$|\%|\>"
ssh_cmd = "ssh user@192.168.1.1"

try:
     ssh = pexpect.spawn(ssh_cmd)
     ssh.sendline("echo hello on remote")
     ssh.expect(PROMPT)
     print "hello on local machine"
     ssh.close()

except Exception as e:
     print e
     sys.exit(2)