鱼壳和ssh远程命令的问题

Question

I use fish shell on my desktop.

We use many servers running nginx within docker. I've tried to create a function so I can ssh to the servers and then log into the docker.

The problem is fish is complaining about the $ in the command, but the command is the one to be executed on the remote server (running bash), not on my machine running fish. I've simplified the script to make it easier to see.

config.fish snippet

function ssh-docker-nginx
ssh -t sysadmin@10.10.10.10 "sudo bash && docker exec -it $(docker ps | grep -i nginx | awk '{print $1}') bash"
end

Fish error:

$(...) is not supported. In fish, please use '(docker)'.
~/.config/fish/config.fish (line 59): ssh -t sysadmin@10.10.10.10 "sudo bash && docker exec -it $(docker ps | grep -i nginx | awk '{print $1}') bash"
                                                                                            ^
from sourcing file ~/.config/fish/config.fish
called during startup

Is there a way to get fish to ignore this?

Answer 1

You'll want to single-quote that argument.

In double-quotes ( " ) fish will try to expand everything that starts with a $ , so it will see that $( and then print the error for it. But it will also see the $1 in your arguments to awk and expand that.

And when you want single-quotes to go to the called command (like here, where you want the argument to awk to be single-quoted because this'll go through bash's expansion), you need to escape the quotes with \\ .

Try

ssh -t sysadmin@10.10.10.10 'sudo bash && docker exec -it $(docker ps | grep -i nginx | awk \'{print $1}\') bash'

Answer 2

Thanks for the great advice and tip above about the single/double quotes. Unfortunately the escaped quotes in awk did not play nicely being passed to ssh.

After various options, I settled with this approach (which needed force tty):

function ssh-docker-nginx
cat docker-bash.sh | ssh -t -t sysadmin@10.10.10.10 
end

# docker-bash.sh
#!/bin/bash
sudo chmod 777 /var/run/docker.sock
sudo docker exec -it $(docker ps | grep -i nginx | awk '{print $1}') bash