Universal Openvpn client OVPN generation script (tls-auth)

ovpn.sh

#!/bin/sh
PKI_DIR=/etc/openvpn/easy-rsa/pki
CRT_DIR=/etc/openvpn/easy-rsa/pki/issued
KEY_DIR=/etc/openvpn/easy-rsa/pki/private
OUTPUT_DIR=/etc/openvpn/server/clients
BASE_CONFIG=/etc/openvpn/server/client.confbase

cat ${BASE_CONFIG} > ${OUTPUT_DIR}/${1}.ovpn
echo '<ca>' | cat >> ${OUTPUT_DIR}/${1}.ovpn
cat ${PKI_DIR}/ca.crt >> ${OUTPUT_DIR}/${1}.ovpn
echo '</ca>\n<cert>' | cat >> ${OUTPUT_DIR}/${1}.ovpn
cat ${CRT_DIR}/${1}.crt >> ${OUTPUT_DIR}/${1}.ovpn
echo '</cert>\n<key>' | cat >> ${OUTPUT_DIR}/${1}.ovpn
cat ${KEY_DIR}/${1}.key >> ${OUTPUT_DIR}/${1}.ovpn
echo '</key>\n<tls-auth>' | cat >> ${OUTPUT_DIR}/${1}.ovpn
cat ${PKI_DIR}/../hmac.key >> ${OUTPUT_DIR}/${1}.ovpn
echo '</tls-auth>' | cat >> ${OUTPUT_DIR}/${1}.ovpn