write-properties-from-env.sh

#!/bin/bash

echo "Writing DATATIME_* environment variables out to a properties file ..."
echo "" > ${DATATIME_HOME}/datatime.properties
for ENV in $(env); do
    key="$( cut -d '=' -f 1 <<< "${ENV}" )"
    val="$( cut -d '=' -f 2- <<< "${ENV}" )"
    if [[ ${key} == DATATIME_* ]]; then
        key=$(echo $key | tr _ . | tr '[:upper:]' '[:lower:]')
        echo "Copying datatime.properties value from environment: ${key}"
        echo "${key} = ${val}" >> ${DATATIME_HOME}/datatime.properties
    fi
done

# Here's one that converts the environment vars into lower camel case while stripping the TOMCAT_ off the front
for ENV in $(env); do
    KEY="$( cut -d '=' -f 1 <<< "${ENV}" )"
    VAL="$( cut -d '=' -f 2- <<< "${ENV}" )"
    if [[ ${KEY} == TOMCAT_* ]]; then
        PROP="tomcat.$(echo ${KEY} | sed 's/TOMCAT_//' | tr '[:upper:]' '[:lower:]' | sed -re 's~(_)(.)~\U\2~g')"
        echo "Writing ${KEY} as ${PROP} to catalina.properties: ${VAL} ..."
        echo "${PROP} = ${VAL}" >> ${CATALINA_HOME}/conf/catalina.properties
    fi
done