diff options
Diffstat (limited to 'bzip2.1.preformatted')
-rw-r--r-- | bzip2.1.preformatted | 113 |
1 files changed, 100 insertions, 13 deletions
diff --git a/bzip2.1.preformatted b/bzip2.1.preformatted index 96b44be..9f18339 100644 --- a/bzip2.1.preformatted +++ b/bzip2.1.preformatted | |||
@@ -1,7 +1,11 @@ | |||
1 | 1 | ||
2 | 2 | ||
3 | |||
4 | bzip2(1) bzip2(1) | ||
5 | |||
6 | |||
3 | NNAAMMEE | 7 | NNAAMMEE |
4 | bzip2, bunzip2 - a block-sorting file compressor, v0.9.5 | 8 | bzip2, bunzip2 - a block-sorting file compressor, v1.0 |
5 | bzcat - decompresses files to stdout | 9 | bzcat - decompresses files to stdout |
6 | bzip2recover - recovers data from damaged bzip2 files | 10 | bzip2recover - recovers data from damaged bzip2 files |
7 | 11 | ||
@@ -54,6 +58,18 @@ DDEESSCCRRIIPPTTIIOONN | |||
54 | filename.bz2 becomes filename | 58 | filename.bz2 becomes filename |
55 | filename.bz becomes filename | 59 | filename.bz becomes filename |
56 | filename.tbz2 becomes filename.tar | 60 | filename.tbz2 becomes filename.tar |
61 | |||
62 | |||
63 | |||
64 | 1 | ||
65 | |||
66 | |||
67 | |||
68 | |||
69 | |||
70 | bzip2(1) bzip2(1) | ||
71 | |||
72 | |||
57 | filename.tbz becomes filename.tar | 73 | filename.tbz becomes filename.tar |
58 | anyothername becomes anyothername.out | 74 | anyothername becomes anyothername.out |
59 | 75 | ||
@@ -109,6 +125,17 @@ DDEESSCCRRIIPPTTIIOONN | |||
109 | you recover the original uncompressed data. You can use | 125 | you recover the original uncompressed data. You can use |
110 | _b_z_i_p_2_r_e_c_o_v_e_r to try to recover data from damaged files. | 126 | _b_z_i_p_2_r_e_c_o_v_e_r to try to recover data from damaged files. |
111 | 127 | ||
128 | |||
129 | |||
130 | 2 | ||
131 | |||
132 | |||
133 | |||
134 | |||
135 | |||
136 | bzip2(1) bzip2(1) | ||
137 | |||
138 | |||
112 | Return values: 0 for a normal exit, 1 for environmental | 139 | Return values: 0 for a normal exit, 1 for environmental |
113 | problems (file not found, invalid flags, I/O errors, &c), | 140 | problems (file not found, invalid flags, I/O errors, &c), |
114 | 2 to indicate a corrupt compressed file, 3 for an internal | 141 | 2 to indicate a corrupt compressed file, 3 for an internal |
@@ -163,6 +190,18 @@ OOPPTTIIOONNSS | |||
163 | --qq ----qquuiieett | 190 | --qq ----qquuiieett |
164 | Suppress non-essential warning messages. Messages | 191 | Suppress non-essential warning messages. Messages |
165 | pertaining to I/O errors and other critical events | 192 | pertaining to I/O errors and other critical events |
193 | |||
194 | |||
195 | |||
196 | 3 | ||
197 | |||
198 | |||
199 | |||
200 | |||
201 | |||
202 | bzip2(1) bzip2(1) | ||
203 | |||
204 | |||
166 | will not be suppressed. | 205 | will not be suppressed. |
167 | 206 | ||
168 | --vv ----vveerrbboossee | 207 | --vv ----vveerrbboossee |
@@ -217,6 +256,18 @@ MMEEMMOORRYY MMAANNAAGGEEMMEENNTT | |||
217 | 256 | ||
218 | Larger block sizes give rapidly diminishing marginal | 257 | Larger block sizes give rapidly diminishing marginal |
219 | returns. Most of the compression comes from the first two | 258 | returns. Most of the compression comes from the first two |
259 | |||
260 | |||
261 | |||
262 | 4 | ||
263 | |||
264 | |||
265 | |||
266 | |||
267 | |||
268 | bzip2(1) bzip2(1) | ||
269 | |||
270 | |||
220 | or three hundred k of block size, a fact worth bearing in | 271 | or three hundred k of block size, a fact worth bearing in |
221 | mind when using _b_z_i_p_2 on small machines. It is also | 272 | mind when using _b_z_i_p_2 on small machines. It is also |
222 | important to appreciate that the decompression memory | 273 | important to appreciate that the decompression memory |
@@ -270,6 +321,19 @@ MMEEMMOORRYY MMAANNAAGGEEMMEENNTT | |||
270 | -9 7600k 3700k 2350k 828642 | 321 | -9 7600k 3700k 2350k 828642 |
271 | 322 | ||
272 | 323 | ||
324 | |||
325 | |||
326 | |||
327 | |||
328 | 5 | ||
329 | |||
330 | |||
331 | |||
332 | |||
333 | |||
334 | bzip2(1) bzip2(1) | ||
335 | |||
336 | |||
273 | RREECCOOVVEERRIINNGG DDAATTAA FFRROOMM DDAAMMAAGGEEDD FFIILLEESS | 337 | RREECCOOVVEERRIINNGG DDAATTAA FFRROOMM DDAAMMAAGGEEDD FFIILLEESS |
274 | _b_z_i_p_2 compresses files in blocks, usually 900kbytes long. | 338 | _b_z_i_p_2 compresses files in blocks, usually 900kbytes long. |
275 | Each block is handled independently. If a media or trans- | 339 | Each block is handled independently. If a media or trans- |
@@ -324,6 +388,18 @@ PPEERRFFOORRMMAANNCCEE NNOOTTEESS | |||
324 | operate in, and then charges all over it in a fairly ran- | 388 | operate in, and then charges all over it in a fairly ran- |
325 | dom fashion. This means that performance, both for com- | 389 | dom fashion. This means that performance, both for com- |
326 | pressing and decompressing, is largely determined by the | 390 | pressing and decompressing, is largely determined by the |
391 | |||
392 | |||
393 | |||
394 | 6 | ||
395 | |||
396 | |||
397 | |||
398 | |||
399 | |||
400 | bzip2(1) bzip2(1) | ||
401 | |||
402 | |||
327 | speed at which your machine can service cache misses. | 403 | speed at which your machine can service cache misses. |
328 | Because of this, small changes to the code to reduce the | 404 | Because of this, small changes to the code to reduce the |
329 | miss rate have been observed to give disproportionately | 405 | miss rate have been observed to give disproportionately |
@@ -337,14 +413,14 @@ CCAAVVEEAATTSS | |||
337 | but the details of what the problem is sometimes seem | 413 | but the details of what the problem is sometimes seem |
338 | rather misleading. | 414 | rather misleading. |
339 | 415 | ||
340 | This manual page pertains to version 0.9.5 of _b_z_i_p_2_. Com- | 416 | This manual page pertains to version 1.0 of _b_z_i_p_2_. Com- |
341 | pressed data created by this version is entirely forwards | 417 | pressed data created by this version is entirely forwards |
342 | and backwards compatible with the previous public | 418 | and backwards compatible with the previous public |
343 | releases, versions 0.1pl2 and 0.9.0, but with the follow- | 419 | releases, versions 0.1pl2, 0.9.0 and 0.9.5, but with the |
344 | ing exception: 0.9.0 and above can correctly decompress | 420 | following exception: 0.9.0 and above can correctly decom- |
345 | multiple concatenated compressed files. 0.1pl2 cannot do | 421 | press multiple concatenated compressed files. 0.1pl2 can- |
346 | this; it will stop after decompressing just the first file | 422 | not do this; it will stop after decompressing just the |
347 | in the stream. | 423 | first file in the stream. |
348 | 424 | ||
349 | _b_z_i_p_2_r_e_c_o_v_e_r uses 32-bit integers to represent bit posi- | 425 | _b_z_i_p_2_r_e_c_o_v_e_r uses 32-bit integers to represent bit posi- |
350 | tions in compressed files, so it cannot handle compressed | 426 | tions in compressed files, so it cannot handle compressed |
@@ -355,21 +431,32 @@ CCAAVVEEAATTSS | |||
355 | AAUUTTHHOORR | 431 | AAUUTTHHOORR |
356 | Julian Seward, jseward@acm.org. | 432 | Julian Seward, jseward@acm.org. |
357 | 433 | ||
434 | http://sourceware.cygnus.com/bzip2 | ||
358 | http://www.muraroa.demon.co.uk | 435 | http://www.muraroa.demon.co.uk |
359 | 436 | ||
360 | The ideas embodied in _b_z_i_p_2 are due to (at least) the fol- | 437 | The ideas embodied in _b_z_i_p_2 are due to (at least) the fol- |
361 | lowing people: Michael Burrows and David Wheeler (for the | 438 | lowing people: Michael Burrows and David Wheeler (for the |
362 | block sorting transformation), David Wheeler (again, for | 439 | block sorting transformation), David Wheeler (again, for |
363 | the Huffman coder), Peter Fenwick (for the structured cod- | 440 | the Huffman coder), Peter Fenwick (for the structured cod- |
364 | ing model in the original _b_z_i_p_, and many refinements), and | 441 | ing model in the original _b_z_i_p_, and many refinements), and |
365 | Alistair Moffat, Radford Neal and Ian Witten (for the | 442 | Alistair Moffat, Radford Neal and Ian Witten (for the |
366 | arithmetic coder in the original _b_z_i_p_)_. I am much | 443 | arithmetic coder in the original _b_z_i_p_)_. I am much |
367 | indebted for their help, support and advice. See the man- | 444 | indebted for their help, support and advice. See the man- |
368 | ual in the source distribution for pointers to sources of | 445 | ual in the source distribution for pointers to sources of |
369 | documentation. Christian von Roques encouraged me to look | 446 | documentation. Christian von Roques encouraged me to look |
370 | for faster sorting algorithms, so as to speed up compres- | 447 | for faster sorting algorithms, so as to speed up compres- |
371 | sion. Bela Lubkin encouraged me to improve the worst-case | 448 | sion. Bela Lubkin encouraged me to improve the worst-case |
372 | compression performance. Many people sent patches, helped | 449 | compression performance. Many people sent patches, helped |
373 | with portability problems, lent machines, gave advice and | 450 | with portability problems, lent machines, gave advice and |
374 | were generally helpful. | 451 | were generally helpful. |
375 | 452 | ||
453 | |||
454 | |||
455 | |||
456 | |||
457 | |||
458 | |||
459 | |||
460 | 7 | ||
461 | |||
462 | |||