Pipes Breaking With System Function

Help & Support
1

I found some instructions on here yesterday for using this system function in this thread.

I was pleased to see the person in this example was able to use multiple pipes without an issue. Unfortunately I did not have the same luck. Here is some code I tried:

Process.run("sshpass -p \\"password\\" ssh -o StrictHostKeyChecking=no -T user@192.168.x.x \"ps faux | awk '/mysql/ { print $2 }'\\"", shell: true) do |proc|
  IO.copy(proc.output, STDOUT)
end

This outputs the following:

./system 
user     1114  0.0  0.1   8488  2656 ?        Ss   20:42   0:00          \_ bash -c ps faux | awk '/mysql/ { print  }'
user     1116  0.0  0.1  10428  2652 ?        S    20:42   0:00              \_ awk /mysql/ { print  }
mysql      435  0.0  3.1 729344 62924 ?        Ssl  19:35   0:03 /usr/sbin/mysqld

If you know anything about Bash, what’s after the pipe is not being executed. And if I try running something with more than one pipe outputs there’s no output at all. I tried this on both Debian and Arch Linux with the same results. Did something change with this function? Or is there another way to do this?

Thanks

2

It looks like just the $2 gets lost? Did you try escaping it?

3

Yep, that worked. A little embarrassed I didn’t see that, but I’ll blame that on it being late and me being tired. Thank you!