You could alternatively try to untar just the file you want to check.
This might result in a build failure, that you can catch with antcontrib

-----Ursprüngliche Nachricht-----
Von: Ben Tu [mailto:ben...@gmail.com] 
Gesendet: Freitag, 6. Mai 2011 18:09
An: user@ant.apache.org
Betreff: How can I check if file exists in gz compress file?

Hi,

Is there a task in Ant that I can check if the file exists in myfile.tar.gz
file without extracting it?



Here is the content of myfile.tar.gz after extracted.

Dir1/

   fileA

   fileB

dir2/

   fileC



I want to check if fileC exists in myfile.tar.gz without extracting
myfile.tar.gz. is there such a task in Ant for this purpose?



thanks, Ben

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