Check the help or man pages for your version. Some (SCO) don't allow this. GNU tar does allow this - but only on uncompressed archives. This means you need to gunzip the tar file first, then append to it, then gzip it again.
tar --help
and then look at the -r (--append) and -u (--update) options.
Hemo is correct. You will have to gunzip the compressed file first. The man pages state that you can us the -r option but the file must be of the same Block Size.
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