Lines Matching +full:multi +full:- +full:touch
3 bzip2, bunzip2 \- a block-sorting file compressor, v1.0.8
5 bzcat \- decompresses files to stdout
7 bzip2recover \- recovers data from damaged bzip2 files
12 .RB [ " \-cdfkqstvzVL123456789 " ]
19 .RB [ " \-fkvsVL " ]
25 .RB [ " \-s " ]
35 compresses files using the Burrows-Wheeler block sorting
38 LZ77/LZ78-based compressors, and approaches the performance of the PPM
41 The command-line options are deliberately very similar to
48 command-line flags. Each file is replaced by a compressed version of
57 MS-DOS.
63 files. If you want this to happen, specify the \-f flag.
76 .I bzip2 \-d)
112 testing (\-t)
117 giving the \-c flag. Multiple files may be compressed and
132 .I bzip2 -dc)
153 As a self-check for your protection,
156 uses 32-bit CRCs to
181 .B \-c --stdout
184 .B \-d --decompress
197 .B \-z --compress
198 The complement to \-d: forces compression, regardless of the
201 .B \-t --test
205 .B \-f --force
215 correct magic header bytes. If forced (-f), however, it will pass
218 .B \-k --keep
222 .B \-s --small
228 During compression, \-s selects a block size of 200k, which limits
231 less), use \-s for everything. See MEMORY MANAGEMENT below.
233 .B \-q --quiet
234 Suppress non-essential warning messages. Messages pertaining to
237 .B \-v --verbose
238 Verbose mode -- show the compression ratio for each file processed.
239 Further \-v's increase the verbosity level, spewing out lots of
242 .B \-L --license -V --version
245 .B \-1 (or \-\-fast) to \-9 (or \-\-best)
248 The \-\-fast and \-\-best aliases are primarily for GNU gzip
249 compatibility. In particular, \-\-fast doesn't make things
251 And \-\-best merely selects the default behaviour.
253 .B \--
256 with a dash, for example: bzip2 \-- \-myfilename.
258 .B \--repetitive-fast --repetitive-best
268 compression and decompression. The flags \-1 through \-9
275 that the flags \-1 to \-9 are irrelevant to and so ignored
302 option only where necessary. The relevant flag is -s.
309 -- that means most files you'd encounter using a large block size. The
312 20,000 bytes long with the flag -9 will cause the compressor to
313 allocate around 7600k of memory, but only touch 400k + 20000 * 8 = 560
315 touch 100k + 20000 * 4 = 180 kbytes.
325 Flag usage usage -s usage Size
327 -1 1200k 500k 350k 914704
328 -2 2000k 900k 600k 877703
329 -3 2800k 1300k 850k 860338
330 -4 3600k 1700k 1100k 846899
331 -5 4400k 2100k 1350k 845160
332 -6 5200k 2500k 1600k 838626
333 -7 6100k 2900k 1850k 834096
334 -8 6800k 3300k 2100k 828642
335 -9 7600k 3700k 2350k 828642
341 a multi-block .bz2
345 The compressed representation of each block is delimited by a 48-bit
347 reasonable certainty. Each block also carries its own 32-bit CRC, so
355 \-t
365 wildcards in subsequent processing -- for example,
366 "bzip2 -dc rec*file.bz2 > recovered_data" -- processes the files in
372 futile to use it on damaged single-block files, since a
384 worst-case and average-case compression time is in the region of 10:1.
386 \-vvvv option to monitor progress in great detail, if you want.
417 versions prior to 1.0.2 used 32-bit integers to represent
420 64-bit ints on some platforms which support them (GNU supported
424 with MaybeUInt64 set to be an unsigned 64-bit integer.
448 worst-case compression performance.