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02-26-2008
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Update compressed archive (TAR)
Is it possible to update a file in a compressed archive.tgz using the tar app without uncompressing/extracting, update and compressing/creating ?
Code:
tar -uvzf archive.tgz ./file.txt tar: Cannot update compressed archives Try `tar --help' for more information. 
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02-26-2008
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As far as I know, I think you are forced to uncompress the tarfile before trying an update and then recompress the updated file
 I thought it was possible to do the trick with a named pipe but the tar update command needs a real non-compressed tarfile to process, so it's useless.
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