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Topic: Gzip


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In the News (Thu 12 Nov 09)

  
  Gzip   (Site not responding. Last check: 2007-10-21)
Gzip is short for GNU Zip, a GNU open-source replacement for the Unix 'compress' program.
Gzip is based on the 'deflate' algorithm, which is a combination of LZ77 and Huffman coding.
The Zlib compressed data format, the 'deflate' algorithm and the Gzip file format were standardised respectively as RFC 1950, RFC 1951 and RFC 1952.
bopedia.com /en/wikipedia/g/gz/gzip.html   (235 words)

  
 DECS - Gzip
Gzip is a compression utility that will compress a given file to a smaller size for a greater efficiency in storing and transferring files.
Gzip can be used to reduce your amount of disk space and to store more files for your personal use.
Gzip is automatically included in your path, so in order to use gzip all you need to do is type gzip and it's options.
www.egr.msu.edu /decs/facilities/software/gzip.php   (351 words)

  
 gzip
If the input data is not in a format recognized by `gzip', and if the option --stdout is also given, copy the input data without change to the standard ouput: let `zcat' behave as `cat'.
If any of the file names specified on the command line are directories, `gzip' will descend into the directory and compress all the files it finds there (or decompress them in the case of `gunzip').
`gzip' is designed as a complement to `tar', not as a replacement.
www.ss64.com /bash/gzip.html   (540 words)

  
 gzip   (Site not responding. Last check: 2007-10-21)
For example: gzip -c file1 > foo.gz gzip -c file2 >> foo.gz Then gunzip -c foo is equivalent to cat file1 file2 In case of damage to one member of a.gz file, other members can still be recovered (if the damaged member is removed).
For example: for sh: GZIP="-8v --name"; export GZIP for csh: setenv GZIP "-8v --name" for MSDOS: set GZIP=-8v --name On Vax/VMS, the name of the environment variable is GZIP_OPT, to avoid a conflict with the symbol set for invocation of the program.
The gzip format represents the the input size modulo 2^32, so the --list option reports incorrect uncompressed sizes and compression ratios for uncompressed files 4 GB and larger.
gd.tuwien.ac.at /linuxcommand.org/man_pages/gzip1.html   (2280 words)

  
 The gzip home page
gzip 1.2.4 may crash when an input file name is too long (over 1020 characters).
gzip was developed as a replacement for compress because of the UNISYS and IBM patents covering the LZW algorithm used by compress.
The first version of the compression algorithm used by gzip appeared in zip 0.9, publicly released on July 11th 1991.
www.gzip.org   (1682 words)

  
 Netmar Online System Manual - gzip(1)   (Site not responding. Last check: 2007-10-21)
Gzip attempts to truncate only the parts of the file name longer than 3 characters.
If the input data is not in a format recognized by gzip, and if the option --stdout is also given, copy the input data without change to the stan- dard ouput: let zcat behave as cat.
For example: for sh: GZIP="-8 -v"; export GZIP for csh: setenv GZIP "-8 -v" for MSDOS: set GZIP=-8 -v On Vax/VMS, the name of the environment variable is GZIP_OPT, to avoid a conflict with the symbol set for invo- cation of the program.
netmar.com /cgi-bin/sec/man2html?cgi_command=gzip(1)   (1890 words)

  
 gzip - GNU Project - Free Software Foundation (FSF)   (Site not responding. Last check: 2007-10-21)
The format of the.gz files generated by gzip is described in RFCs (Request For Comments) 1951 and 1952.
Gzip can be found on in the subdirectory
Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.
www.gnu.org /software/gzip/gzip.html   (187 words)

  
 Info: (gzip.info.gz) Overview
Compressed files can be restored to their original form using `gzip -d' or `gunzip' or `zcat'.
The worst case expansion is a few bytes for the `gzip' file header, plus 5 bytes every 32K block, or an expansion ratio of 0.015% for large files.
The `gzip' file format is specified in P. Deutsch, GZIP file format specification version 4.3, Internet RFC 1952 (ftp://ftp.isi.edu/in-notes/rfc1952.txt) (May 1996).
www.cit.gu.edu.au /teaching/2105CIT/cgi-bin/info2html.cgi?(gzip.info.gz)Overview   (711 words)

  
 [No title]   (Site not responding. Last check: 2007-10-21)
gzip is free software, you can redistribute it and/or modify it under the terms of the GNU General Public License, a copy of which is provided under the name COPYING.
Note about zip vs. gzip: The name 'gzip' was a very unfortunate choice, because zip and gzip are two really different programs, although the actual compression and decompression sources were written by the same persons.
The gzip header format is deliberately different from that of pkzip to avoid such a constraint.
www.netlib.org /gnu/gzip/readme   (998 words)

  
 164.gzip: SPEC CPU2000 Benchmark Description
gzip (GNU zip) is a popular data compression program written by Jean-Loup Gailly for the GNU project.
With the exception of the random data, these components were selected as a reasonably representative set of things that gzip might be most often used on.
Each input set is compressed and decompressed at several different blocking factors ("compression levels"), with the end result of the process being compared to the original data after each step.
www.spec.org /osg/cpu2000/CINT2000/164.gzip/docs/164.gzip.html   (260 words)

  
 Info: (gzip.info.gz) Tapes   (Site not responding. Last check: 2007-10-21)
6 Using `gzip' on tapes *********************** When writing compressed data to a tape, it is generally necessary to pad the output with zeroes up to a block boundary.
When the data is read and the whole block is passed to `gunzip' for decompression, `gunzip' detects that there is extra trailing garbage after the compressed data and emits a warning by default if the garbage contains nonzero bytes.
This option can be set in the `GZIP' environment variable, as in: for sh: GZIP="-q" tar -xfz --block-compress /dev/rst0 for csh: (setenv GZIP "-q"; tar -xfz --block-compress /dev/rst0) In the above example, `gzip' is invoked implicitly by the `-z' option of GNU `tar'.
www.cit.gu.edu.au /teaching/2105CIT/cgi-bin/info2html.cgi?(gzip.info.gz)Tapes   (153 words)

  
 GZIP Patch Compression
Mentor Graphics' patches are compressed using the "gzip" compression utility.
Gzip is just as reliable and has better compression capabilities than compress (see table), therefore resulting in smaller patch files and improved transfer times.
Here is a site that has gzip executables by platform.
www.mentor.com /supportnet/gzip_readme.html   (154 words)

  
 [#CACHE-49] Add Http1.1 Compression (GZip) and increase efficiency - OpenSymphony JIRA
As you may know, all http1.1 compliant browsers must be capable of reading content compressed using gzip (At least that's my understanding - it's mentioned at http://www.w3.org/Protocols/rfc2068/rfc2068) This seems to reduce the size of most webpages to about 33% of their original size.
If the client doesn't support GZIP the content is uncompressed and sent, thus going for option 2 from the original Issue description, since this will save memory and is the most appropriate approach for my usecase.
I can later on submit a gzip filter for oscache, but I think the first step is to have the cache filter be aware of the potential existence of gzip filters down the filter chain, and behave appropriately in those cases.
jira.opensymphony.com /secure/ViewIssue.jspa?key=CACHE-49   (2297 words)

  
 RFC 1952 (rfc1952) - GZIP file format specification version 4.3
Appendix: Jean-Loup Gailly's gzip utility The most widely used implementation of gzip compression, and the original documentation on which this specification is based, were created by Jean-Loup Gailly .
When compressing or decompressing a file, gzip preserves the protection, ownership, and modification time attributes on the local file system, since there is no provision for representing protection attributes in the gzip file format itself.
Since the file format includes a modification time, the gzip decompressor provides a command line switch that assigns the modification time from the file, rather than the local modification time of the compressed input, to the decompressed output.
www.faqs.org /rfcs/rfc1952.html   (2377 words)

  
 GZIP
Force compression or decompression even if the file has multiple links or the corresponding file already exists, or if the compressed data is read from or written to a terminal.
If −f is not given, and when not running in the background, gzip prompts to verify whether an existing file should be overwritten.
In the above example, gzip is invoked implicitly by the -z option of GNU tar.
www.devdaily.com /unix/man/man1/gunzip.1.shtml   (1913 words)

  
 DataCompression.info - Gzip   (Site not responding. Last check: 2007-10-21)
Gzip is often used in confunction with tar - tar combines a group of files into a single archive, then gzip compresses the result.
Based on the GZip standard and optimized for the Macintosh platform, an easy-to-use, effective GZ compressor has finally been brought to the Mac OS.
Gzip encoding is a great way to serve up your web pages, because all modern browsers can render this format.
datacompression.info /Gzip.shtml   (961 words)

  
 ! Aware to man pages: gzip(1)
By default, gzip keeps the original file name and times- tamp in the compressed file.
When compressing, gzip uses the.tgz extension if neces- sary instead of truncating a file with a.tar extension.
For exam- ple: gzip -c file1 > foo.gz gzip -c file2 >> foo.gz Then gunzip -c foo is equivalent to cat file1 file2 In case of damage to one member of a.gz file, other mem- bers can still be recovered (if the damaged member is removed).
www.rocketaware.com /man/man1/gzip.1.htm   (2198 words)

  
 Gzip Details, Meaning Gzip Article and Explanation Guide
Gzip is short for GNU Zip, a GNU open-source replacement for the Unix
Since the late-1990s there has been some movement from gzip to bzip2 which produces considerably smaller files.
Nowadays more and more software is instead distributed as.tar.bz2 archives because bzip2 achieves greater compression than gzip, though at the expense of processing time.
www.e-paranoids.com /g/gz/gzip.html   (263 words)

  
 ONJava.com: Two Servlet Filters Every Web Application Should Have
Since checking for GZIP compression support is nearly trivial, it is no problem to have a filter send GZIP-compressed content to only those users that can handle it.
GZIP compression will usually get you around a 6:1 compression ratio; it depends on how much content you are sending and what the content is. In practice, this means you will send content to a user up to six times faster if you simply use GZIP compression whenever you can.
The next important part of the GZIP filter code is compressing normal content with GZIP compression.
www.onjava.com /pub/a/onjava/2003/11/19/filters.html   (1399 words)

  
 Tutorial on Decompress gzip File on Windows OS   (Site not responding. Last check: 2007-10-21)
Gzip is a free software by the Free Software Foundation, or, GNU Project.
The most reliable way to decompress a gzipped file is to use the gzip program.
For the latest version of gzip or gzip on other computer systems, please visit the home of gzip.
www.o-bible.com /gzip.html   (454 words)

  
 IT Resource Center forums - gzip fails - var full
gzip writes the.gz file in the same directory as the source file.
gzip will not remove the source file until after the gzipped file is completely written.
If the filesystem runs out of space, gzip will wrapup and delete the.gz file is was writing.
forums1.itrc.hp.com /service/forums/questionanswer.do?threadId=181383   (344 words)

  
 man: gzip
The gzip file format is specified in P. Deutsch, GZIP file format spec- ification version 4.3, , Inter- net RFC 1952 (May 1996).
znew(1), zcmp(1), zmore(1), zforce(1), gzexe(1), zip(1), unzip(1), com- press(1), pack(1), compact(1), compat(5) The gzip file format is specified in P. Deutsch, GZIP file format spec- ification version 4.3, , Inter- net RFC 1952 (May 1996).
Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc. Copyright (C) 1992, 1993 Jean-loup Gailly Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies.
www.hmug.org /man/1/gzip.php   (2383 words)

  
 New thread for gzip... - vBulletin Community Forum
The higher the compression level, (gzip normally allows values between 0 and 9), the better the compression effect, but the higher the CPU time consumption as well.
before we added a new hard drive, we were using the vb gzip within the control panel and staying at around 3 gig per day on the server.
So now with new hard drive, mod_gzip is installed and I have to disable the vb gzip in the cp.
www.vbulletin.com /forum/showthread.php?t=66664   (793 words)

  
 Compressing Web Content with mod_gzip and mod_deflate | Linux Journal
Some important MIME types that cannot be GZIP encoded are external JavaScript files, PDF files and image files.
With mod_deflate for Apache 2.0.x, the GZIP encoding of documents can be enabled in one of two ways: explicit exclusion of files by extension or explicit inclusion of files by MIME type.
This response indicates it was generated based on the request containing the Accept-Encoding: gzip header.
www.linuxjournal.com /article.php?sid=6802   (2415 words)

  
 SecurityTracker.com Archives - (NetBSD Issues Fix) Gzip File Compression Utility Buffer Overflow Used By Many FTP ...
Description: A buffer overflow vulnerability was reported in the gzip file compression utility, used by many FTP servers to allow remote users to compress files for download.
It is reported that many FTP servers use /bin/gzip for file compression and, therefore, allow remote users to execute arbitrary code by invoking gzip on a long file name.
If the process using gzip is a remote FTP server, then the remote user can execute arbitrary code on the FTP server with the privileges of the FTP server process.
www.securitytracker.com /alerts/2002/Mar/1003802.html   (766 words)

  
 HTTP Compression Speeds up the Web: WebReference.com
The idea is to compress data being sent out from your Web server, and have the browser decompress this data on the fly, thus reducing the amount of data sent and increasing the page display speed.
Netscape 4.5 is the only browser that supports gzip encoding for HTML files even though it communicates via HTTP/1.0.
However, Netscape 4.x still sometimes fails to decompress gzipped CSS and JavaScript when referenced via separate HTTP calls (embedded in HTML they are okay), so some webmasters have excluded either those MIME types or Netscape 4 from compression (mod_gzip doesn't allow you to "AND" both conditions).
webreference.com /internet/software/servers/http/compression   (892 words)

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