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4 bzip2, bunzip2 \- a block-sorting file compressor, v1.0.8
6 bzcat \- decompresses files to stdout
8 bzip2recover \- recovers data from damaged bzip2 files
13 .RB [ " \-cdfkqstvzVL123456789 " ]
20 .RB [ " \-fkvsVL " ]
26 .RB [ " \-s " ]
36 compresses files using the Burrows-Wheeler block sorting
39 LZ77/LZ78-based compressors, and approaches the performance of the PPM
42 The command-line options are deliberately very similar to
49 command-line flags. Each file is replaced by a compressed version of
58 MS-DOS.
63 will by default not overwrite existing
64 files. If you want this to happen, specify the \-f flag.
77 .I bzip2 \-d)
113 testing (\-t)
118 giving the \-c flag. Multiple files may be compressed and
126 later. Earlier versions of
133 .I bzip2 -dc)
154 As a self-check for your protection,
157 uses 32-bit CRCs to
165 the check occurs upon decompression, so it can only tell you that
182 .B \-c --stdout
185 .B \-d --decompress
198 .B \-z --compress
199 The complement to \-d: forces compression, regardless of the
202 .B \-t --test
203 Check integrity of the specified file(s), but don't decompress them.
206 .B \-f --force
210 existing output files. Also forces
216 correct magic header bytes. If forced (-f), however, it will pass
219 .B \-k --keep
223 .B \-s --small
229 During compression, \-s selects a block size of 200k, which limits
232 less), use \-s for everything. See MEMORY MANAGEMENT below.
234 .B \-q --quiet
235 Suppress non-essential warning messages. Messages pertaining to
238 .B \-v --verbose
239 Verbose mode -- show the compression ratio for each file processed.
240 Further \-v's increase the verbosity level, spewing out lots of
243 .B \-L --license -V --version
246 .B \-1 (or \-\-fast) to \-9 (or \-\-best)
249 The \-\-fast and \-\-best aliases are primarily for GNU gzip
250 compatibility. In particular, \-\-fast doesn't make things
252 And \-\-best merely selects the default behaviour.
254 .B \--
257 with a dash, for example: bzip2 \-- \-myfilename.
259 .B \--repetitive-fast --repetitive-best
260 These flags are redundant in versions 0.9.5 and above. They provided
262 earlier versions, which was sometimes useful. 0.9.5 and above have an
269 compression and decompression. The flags \-1 through \-9
276 that the flags \-1 to \-9 are irrelevant to and so ignored
303 option only where necessary. The relevant flag is -s.
310 -- that means most files you'd encounter using a large block size. The
313 20,000 bytes long with the flag -9 will cause the compressor to
326 Flag usage usage -s usage Size
328 -1 1200k 500k 350k 914704
329 -2 2000k 900k 600k 877703
330 -3 2800k 1300k 850k 860338
331 -4 3600k 1700k 1100k 846899
332 -5 4400k 2100k 1350k 845160
333 -6 5200k 2500k 1600k 838626
334 -7 6100k 2900k 1850k 834096
335 -8 6800k 3300k 2100k 828642
336 -9 7600k 3700k 2350k 828642
342 a multi-block .bz2
346 The compressed representation of each block is delimited by a 48-bit
348 reasonable certainty. Each block also carries its own 32-bit CRC, so
356 \-t
366 wildcards in subsequent processing -- for example,
367 "bzip2 -dc rec*file.bz2 > recovered_data" -- processes the files in
373 futile to use it on damaged single-block files, since a
383 compress more slowly than normal. Versions 0.9.5 and above fare much
384 better than previous versions in this respect. The ratio between
385 worst-case and average-case compression time is in the region of 10:1.
386 For previous versions, this figure was more like 100:1. You can use the
387 \-vvvv option to monitor progress in great detail, if you want.
411 backwards compatible with the previous public releases, versions
418 versions prior to 1.0.2 used 32-bit integers to represent
420 files more than 512 megabytes long. Versions 1.0.2 and above use
421 64-bit ints on some platforms which support them (GNU supported
425 with MaybeUInt64 set to be an unsigned 64-bit integer.
449 worst-case compression performance.