отображать файлы groff и справочные страницы на X и tty (display groff files and man pages on X and tty)
Decompression
The program has a decompression facility. If standard input or a
file that was retrieved from the command line parameters is
compressed with a format that is supported by either gzip(1) or
bzip2(1) it is decompressed on-the-fly. This includes the GNU
.gz, .bz2, and the traditional .Z compression. The program
displays the concatenation of all decompressed input in the
sequence that was specified on the command line.
