Replace delimited block of text in file with the contents of another file
- by rmarimon
I need to write a simple script to replace a block of text in a configuration file with the contents of another file.
Let's assume with have the following simplified files:
server.xml
<?xml version='1.0' encoding='UTF-8'?>
<Server port="8005" shutdown="SHUTDOWN">
  <Service name="Catalina">
    <Connector port="80" protocol="HTTP/1.1"/>
    <Engine name="Catalina" defaultHost="localhost">
      <!-- BEGIN realm -->
        <sometags/>
        <sometags/>
      <!-- END realm -->
      <Host name="localhost" appBase="webapps"/>
    </Engine>
  </Service>
</Server>
realm.xml
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
       resourceName="UserDatabase"/>
I want to run a script and have realm.xml replace the contents between the <!-- BEGIN realm --> and <!-- END realm --> lines.  If realm.xml changes then whenever the script is run again it will replace the lines again with the new contents of realm.xml.  This is intended to be run in /etc/init.d/tomcat on startup of the service on multiple installations on which the realm is going to be different.
I'm not so sure how can I do this simply with awk or sed.