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.
