SSH Multi-Host Execution

hostList.txt

198.209.202.11
198.31.175.22
198.209.133.33

runCmdOnSSH.sh

#!/bin/bash
#
# Run a command on several remote hosts via SSH connection. <ps -fe | grep 'string'> is used as example in this demo script.
# The list of hosts(IPs) is to be supplied as one of the arguments. Each IP in a single line followed by line feed (Enter key).
# Uses the SSH Public-Key authentication method to login as particular USER.
#

SEARCH_TEXT=${1:-processName}
USER=${2:-ubuntu}
SSH_PRIVATE_KEY=${3:-"path/to/your/ssh/private/key"}
HOSTS=${4:-"path/to/the/hostList.txt"}


for host in $(cat $HOSTS); do
  #echo "Host IP:$host"
  ssh -i $SSH_PRIVATE_KEY -o StrictHostKeyChecking=no $USER@$host ps -fe | grep $SEARCH_TEXT > "output_${host}.txt"

done