ubuntu指令：bunzip2k

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usage: bzip2 [flags and input files in any order]

-h --help           print this message

-d --decompress     force decompression

-z --compress       force compression

-k --keep           keep (don&＃39;t delete) input files

-f --force          overwrite existing output files

-t --test           test compressed file integrity

-c --stdout         output to standard out

-q --quiet          suppress noncritical error messages

-v --verbose        be verbose (a 2nd -v gives more)

-L --license        display software version & license

-V --version        display software version & license

-s --small          use less memory (at most 2500k)

-1 .. -9            set block size to 100k .. 900k

--fast              alias for -1

--best              alias for –9