Maybe you could copy the file without changing of the timestamp (attribute 
preservelastmodified).
Then do the replace on your file.
Then test via <uptodate> if a change happened.
Delete the copy

This will only work, if replace does not change the timestamp, in case of no 
changes.

Just an idea...

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Von: Prashant Reddy [mailto:[EMAIL PROTECTED] 
Gesendet: Dienstag, 5. Februar 2008 13:06
An: Ant Users List
Betreff: Fail build when 'replace' task cannot find expected number oftokens

Hello ANT users,

Using ANT 1.6.5, a build XML i am using makes use of <replace> task to replace 
certain token in a bunch of Javascript files.

I would like the build to fail when the replace of a token fails, so that when 
someone changes the source file such that <replace> does not find any tokens to 
replace; the incident is caught straight away.

Right now replace only supports printing of summary containing number of tokens 
that were replaced, but this is not good enough for me.

Humm...Sounds like i should look up if ant-unit can help me out.

I would appreciate any suggestions. (Apart from using resourcecount which is in 
ANT 1.7)

Thanks for your time.
-Prashant


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