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#!/usr/bin/env bash

array=(
"1.2.3.4"
"2.1.3.4"
"3.1.2.4"
)

arr=("${array[@]}")
for ix in ${!arr[*]}
do
    ssh -o PasswordAuthentication=no -oStrictHostKeyChecking=no root@${arr[$ix]} "echo ${arr[$ix]} ok"
done