Can someone tell me why this shell script isn't working the way I want it to

ssh hostname ps aux| egrep '.*python' |开发者_如何学C grep -v 'grep'| awk '{print $2}'| xargs kill -KILL

When I run this I get the error message "kill: No such process"

But when I run this:

ssh hostname ps aux| egrep '.*python' | grep -v 'grep' |awk '{print $2}'| xargs echo

It correctly prints the pid. And also

ps aux| egrep '.*python' | grep -v 'grep'| awk '{print $2}' | xargs kill -KILL

works correctly on the localhost.

Your command is only running ps aux on the remote host, everything else gets executed locally.

change it to

ssh hostname "ps aux| egrep '.*python' | grep -v 'grep'| awk '{print \$2}'| xargs kill -KILL"

The usage of the quotes sends the entire command over to the remote host. And then you have to add the \ in front of the $2 because youre inside double quotes, and those single quotes are just characters at that point

As the others have pointed out, you can't just run a piped command through ssh without putting the command sequence in quotation marks.

But there's an even easier way to do what you want:

ssh hostname pkill python

The pkill command will handle all of the process grepping for you.

It can't work that way, the output from ssh is processed on your local machine. So the call to kill will try to terminate a process on your machine, not on the remote machine.

You can try to use the expect tool to solve the problem.

It's because only first command (ps aux) is being provided to ssh as args. Try to use quotes: ssh hostname "ps aux| egrep '.*python' | grep -v 'grep'| awk '{print $2}'| xargs kill -KILL"

In this case "ps aux| egrep '.*python' | grep -v 'grep'| awk '{print $2}'| xargs kill -KILL" would be passed to ssh command as 2nd argument