Apache Ant - Change extension on file

This might not be perfectly on topic, but I can't find anyone that is...

I have an exec in Ant that looks like this:

<exec    taskname    = "convert"
                                executable    = "convert"
                                failonerror    = "true">
                            <arg line="in=@{file} out=???" />

I want to use a command that converts a file. THe in infile name has one extension and the out file another, but the rest of the file name should be the same. How do I get it this way?

The arg line is messed up since I don't know what to write.
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A quick and dirty way would be to just stick the new extension on the end...so your input file would be called:


and your output file could be called:


                          <arg line="in=@{file} out=@{file}.ext" />

Or something...

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