This little command line statement will copy a folder of files to the list (space separated) of hosts in your client list.

for i in `cat client_list.txt`;do `scp -r directory root@$i:~/`;done

You also need to load keychain on your desktop and have your ssh key loaded on the server to avoid typing your password for each host.

You can also run a single command on each server like this example using df -h:

for i in `cat client_list.txt`;do echo $i; ssh root@$i ‘df -h’;done