checks netcat and ssh connectivity to all hosts in /etc/hosts file, outputs Errors

conncheck.sh

#!/bin/bash
# Run as root
# /home/sshuttle/conncheck.sh
## replace 'sshuttle' user with any user that has global SSH access to servers

file=${1:-"/etc/hosts"}
ncat_port=22
RED='\033[1;31m'
GREEN='\033[1;32m'
NC='\033[0m'  # no color
bold=$(tput bold)
clear=$(tput sgr0)

## check if netcat is installed
if (type nc 2>&1 >/dev/null)
then
    echo "netcat is installed, proceeding.."
else
    echo -e "${RED}[ERROR]${NC} netcat is not installed on this host"
    exit 1
fi


while read -r line
do  
    if [[ -n $line ]] && [[ "${line}" != \#* ]]
    then
        ip=$(echo $line | awk '{print $1}')
        hostname=$(echo $line | awk '{print $2}')

        ## if ipv4
        if [[ $ip =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "--------------------------------------"

            ## check netcat connectivity
            if (nc -z -w 2 $ip $ncat_port 2>&1 >/dev/null)
            then
                ncat_status="nc OK"
            else
                echo "${hostname} (${ip}): ${bold}nc ERROR${clear}"
                continue
            fi


            ## attempt ssh connection, get exit code
            ssh -o ConnectTimeout=3 \
            -o "StrictHostKeyChecking no" \
            -o BatchMode=yes \
            -i /home/sshuttle/.ssh/id_ed25519 \
            -q sshuttle@"${ip}" exit </dev/null

            if [ $? -eq 0 ]
            then
                ssh_status="ssh OK"
                
            else
                ssh_status="${bold}ssh ERROR${clear}"
            fi

            echo "${hostname} (${ip}): ${ncat_status} | ${ssh_status}"
        fi
    fi

done < "${file}"