twig template with bash

setWPConfig.sh

#!/bin/bash
# Process twig template for WordPress config
if [ $# -ne 1 ]; then
  echo 1>&2 Usage: $0 domain
  exit 127
fi

# Set variables 
domain=$1

# Variables
dbName='zut'
dbUser='miao'
dbPassword='qwr'
dbHost='lollll'
dbTablePrefix='tab_'
wpHome="http://${domain}"
wpSiteUrl="http://${domain}"

# Regex
REGEX_dbName="s/{{\ dbName\ }}/${dbName}/g"
REGEX_dbUser="s/{{\ dbUser\ }}/${dbUser}/g"
REGEX_dbPassword="s/{{\ dbPassword\ }}/${dbPassword}/g"
REGEX_dbHost="s/{{\ dbHost\ }}/${dbHost}/g"
REGEX_dbTablePrefix="s/{{\ dbTablePrefix\ }}/${dbTablePrefix}/g"
# For variables with '/' use '#' as sed separator
REGEX_wpHome="s#{{\ wpHome\ }}#${wpHome}#g"
REGEX_wpSiteUrl="s#{{\ wpSiteUrl\ }}#${wpSiteUrl}#g"

echo $REGEX_dbTablePrefix

# Process template
$template='wp-config.php.twig'
$configFile="/var/www/${domain}/www/wp-config.php"

cat $template |
  sed -e "${REGEX_dbName}" |
  sed -e "${REGEX_dbUser}" |
  sed -e "${REGEX_dbPassword}" |
  sed -e "${REGEX_dbHost}" |
  sed -e "${REGEX_dbTablePrefix}" |
  sed -e "${REGEX_wpHome}" |
  sed -e "${REGEX_wpSiteUrl}" > ${configFile}