Install self signed certificate on debian machine

installCertificate.sh

#!/bin/bash
 
if [ $# -eq 0 ]
  then
    echo "./installCertificate.sh <HOSTNAME> <PORT>"
    exit
fi
 
HOSTNAME=$1
PORT=$2
 
openssl s_client -connect ${HOSTNAME}:${PORT} -showcerts </dev/null 2>/dev/null | openssl x509 -text > /tmp/${HOSTNAME}.crt
cp /tmp/${HOSTNAME}.crt /usr/local/share/ca-certificates/
chmod 644 /usr/local/share/ca-certificates/${HOSTNAME}.crt
update-ca-certificates --verbose