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@@ -235,6 +235,16 @@ compressed with the
.Dq deflate
algorithm.
Older zip compression algorithms are not supported.
+.Ss Tp Formats
+The libarchive library has experimental support for tp format,
+which was used in Fourth Edition through Sixth Edition Unix.
+(It was supplanted by tar in Seventh Edition Unix.)
+There were several distinct variants of this format; libarchive
+supports the original tp format and the itp variant.
+Currently, tp format support is not enabled by
+.Fn archive_read_support_format_all ,
+it must be explicitly enabled by calling
+.Fn archive_read_support_format_tp .
.Sh SEE ALSO
.Xr cpio 1 ,
.Xr mkisofs 1 ,
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