Replace delimited block of text in file with the contents of another file

Posted by rmarimon on Stack Overflow See other posts from Stack Overflow or by rmarimon
Published on 2010-04-23T15:11:16Z Indexed on 2010/04/23 15:13 UTC
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Filed under:

sed

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awk

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bash

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shell

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scripting

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  and  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.

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