Packs a file using the GZip or BZip2 algorithm. The output file is only generated if it doesn't exist or the source file is newer.
| Attribute | Description | Required |
| src | the file to gzip/bzip. | Yes |
| destfile | the destination file to create. | Exactly one of the two. |
| zipfile | the deprecated old name of destfile. |
<gzip src="test.tar" destfile="test.tar.gz"/>
<bzip2 src="test.tar" destfile="test.tar.bz2"/>
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