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"bztar", "xztar", or "ztar".
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'root_dir' is a directory that will be the root directory of the
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archive; ie. we typically chdir into 'root_dir' before creating the
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archive. 'base_dir' is the directory where we start archiving from;
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ie. 'base_dir' will be the common prefix of all files and
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directories in the archive. 'root_dir' and 'base_dir' both default
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