Bash hash trick with compgen for rpmbuilds

gistfile1.sh

#Declare Variables
cat > cas <<EOF
#CAS TEST CONFIG
# Vars starting with APP_ are used to replace contents in skeletons files

APP_HTTP_PORT=12385
APP_HTTPS_PORT=12386
APP_AJP_PORT=12387

APP_HTTP_MAX_THREADS=150
APP_HTTP_MIN_SPARE_THREADS=25

APP_JMX_READER_USER=reader
APP_JMX_READER_PASSWORD=s3cr3t

APP_JMX_ADMIN_USER=admin
APP_JMX_ADMIN_PASSWORD=s3cr3t

EOF

#Shell Script to build hash
cat > skel_test.sh <<EOF
#!/bin/bash

source cas

ALL_VARS=$(compgen -A variable | grep APP_)

for RES_KEY in $ALL_VARS; do
      eval RES_VAL=\$${RES_KEY}
      XREPLACE="$XREPLACE | sed 's|@${RES_KEY}@|$RES_VAL|g'"
done

for XFILE in server.xml.skel  jmxremote.access.skel ;  do
      DXFILE=${XFILE%.skel}
      eval "cat ${XFILE} $XREPLACE > ${DXFILE}"
done

EOF

#Sample files where contents to be replaced.

cat > jmxremote.access.skel <<EOF
# JMX Access Control file
#
monitorRole   readonly
controlRole   readwrite \
              create javax.management.monitor.*,javax.management.timer.* \
              unregister

@APP_JMX_READER_USER@   readonly
@APP_JMX_ADMIN_USER@    readwrite

EOF

cat > server.xml.skel <<EOF
    <Connector port="@APP_HTTP_PORT@" protocol="HTTP/1.1"
               connectionTimeout="20000" maxThreads="@APP_HTTP_MAX_THREADS@" minSpareThreads="@APP_HTTP_MIN_SPARE_THREADS@"
               redirectPort="@APP_HTTPS_PORT@" />
    <!-- A "Connector" using the shared thread pool-->
    <!--
    <Connector executor="tomcatThreadPool"
               port="@APP_HTTP_PORT@" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="@APP_HTTPS_PORT@" />
    -->
EOF