Suppose we use cscope and/or ctags for indexing source code of our Java project and we want to update the meta data files (e.g. cscope.out, tags) each time after we compile. We can use the --post-comile target to accomplish this. Create a custom_rules.xml in your project root directory with the following content. This file will be included to your main build.xml file.

<?xml version="1.0" encoding="UTF-8"?> 
    <target name="-post-compile"> 
        <exec executable="find" failonerror="true"> 
            <arg line=" . -name *.java"/> 
            <redirector output="cscope.files" /> 
        <exec executable="cscope" failonerror="true"> 
            <arg line="-RUbq" /> 
        <exec executable="ctags" failonerror="true"> 
            <arg line="-R ." /> 

Here we create one task, namely exec task, to execute our commands. Pay special attention to our first command, find. More specifically, how we redirect the output here. The normal bash redirect symbol > doesn't not work here.