Remove user from several machines in parallel

remove_user.sh

#!/bin/bash

user=$1

regions="us sa"
sshOptions="-o BatchMode=yes -o ConnectTimeout=1 -o ConnectionAttempts=1 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o LogLevel=quiet"

ips=""
for region in $regions; do
   ips="$ips $(tws instance list --region ${region}-east-1 | grep running | egrep -o '10\.[0-9]\.[0-9]{1,3}\.[0-9]{1,3}')"
done
echo $ips | tr ' ' '\n' | parallel  -I {} -j 30 "ssh $sshOptions {} 'sudo deluser --remove-home --backup-to /home $user'"