Grep an environment name from tomcat.conf, then delete properties files which don't match that environment.

clean_properties_files.sh

#!/bin/bash

# Removes the -dev and -prod files.
# /var/config/com/company/thing/drivers/config/thing-dev.properties
# /var/config/com/company/thing/drivers/config/thing-prod.properties
# /var/config/com/company/thing/drivers/config/thing-qa.properties
# /var/config/com/company/thing/drivers/config/database.properties

# Looks for "qa" in tomcat.conf on the JAVA_OPTS line:
# JAVA_OPTS="-Denvironment=qa"

environment=$(grep 'JAVA_OPTS="-Denvironment' /etc/tomcat/tomcat.conf | sed -s 's/^JAVA_OPTS="-Denvironment=\([a-z]\+\)"$/\1/' | head -n 1)
find /var/config -regex '.*\-\w+\.properties' -type f | egrep -v "$environment" | xargs --no-run-if-empty rm