`gzip` (or GNU zip) is a file format and corresponding utility for compressing files using the DEFLATE algorithm. The usual extension is `.gz`.

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How to convert a file of format tar.gz to tar.bz2?

Like the title says, how do I do this conversion from the Linux console?
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123 views

rsync: gzip on source tolerant

I need to transfer a couple of log-files each hour to a logstorage which all users can reach, and I use rsync for do that, but the problem comes when the log-file is rotated and automatically zipped, ...
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784 views

Caveats with gzip --rsyncable - no speedup

I am using (trying) gzip to compress an SQL file in an rsyncable way in order to transfer the backup with minimal delay. However it appears that this is not working, since the speedup is always 1.00. ...
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3answers
352 views

What are good compression algorithms for delta synchronization?

When syncing large files over a slow link, it is often useful to use delta compression in order to reduce the bandwidth used. It is also useful to compress files as they take up much less space. ...
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57 views

Gzip, firmware problems

I am trying to unpackage firmware. The file command gives me this. gzip compressed data, ASCII, has CRC, extra field gzip -d gzip.gz gives this. gzip: gzip.gz has flags 0xcf -- not supported Any ...
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How can I get the uncompressed size of gzip file without actually decompressing it?

Please find my OS details: $ uname -a AIX xxyy 1 6 000145364C00 I've tried the following command to get size of a file in gzip archive: $ gzip -l mycontent.DAT.Gz compressed uncompr. ratio ...
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Files with same content but with different md5sums when gzip'd?

I don't know why this is happening, but I upload some files to Amazon S3 then delete the sent files checking their md5sum both in Amazon and locally. But recently I found this issue about the same ...
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2answers
131 views

How to extract such a compressed file?

I have been asked to extract a ZIP file having in it 3 tar files and each tar file contains around 3000 gz files. I had to extract the main ZIP file first then extract the tar files second then ...
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1answer
637 views

Do curl and wget open gzipped files automatically?

I made two http calls to the same gzipped resource from two different machines - RHEL and OSX. curl http://example.com/file.gz The first call returned an expected binary output: /�IQ���} The ...
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4answers
156 views

“.gz” extension somehow appended itself to EVERY FILE on my site… how do I undo it?

Somehow I accidentally appended the extension .gz to ALL files in my entire website directory. How do I undo this? I need them to retain their original file extensions (EG: picture.jpg.gz -> ...
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3answers
4k views

Why is gzip slow despite CPU and hard drive performance not being maxed out?

I have some JSON files, 20 GB each, that I want to compress with gzip: gzip file1.json This takes up one full CPU core, all fine. It processes around 25 MB/s (checked in atop), my hard drive can ...
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2answers
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Time to zip very large (100G) files

I find myself having to compress a number of very large files (80-ish GB), and I am surprised at the (lack of) speed my system is exhibiting. I get about 500 MB / min conversion speed; using top, I ...
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2answers
725 views

What is the difference in various commands for compressing files in linux?

What are the commands for compressing files in linux and what are the difference between them? (for example: tar, gzip, rar). I'm working on Linux Mint 11 and doing a script for compressing files. I ...
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8k views

Is there a way to force gzip not to overwrite files on conflict?

I'm writing a script in which I'm gzipping files. There's a possibility that I might zip a file, create a file of the same name, and try to gzip this as well, e.g. $ ls -l archive/ total 4 ...
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3answers
6k views

Between xz, gzip, and bzip2, which compression algorithim is the most efficient?

Between xz, gzip, and bzip2, which compression algorithm gives the smallest file size and fastest speed when compressing fairly large tarballs?
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2answers
4k views

gzip several files in different directories and copy to new directory

I'm working with several files that are located in different directories that I need to compress into individual .gz files. I also need to move the compressed files to a single directory while leaving ...
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3answers
745 views

What is the equivalent unix command to a Mac OSX “Compress” menu action?

When I right-click a file in Mac OSX and select "Compress 'File Name'", what is the equivalent bash or terminal command to get the same result? Is it just gzip -9 /path/to/filename?
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.tgz file- tar: Unrecognized archive format

I'm trying to install a 10gen build of mongodb on my local mac running Mountain Lion (10.8.3): I fetch it with curl at: curl http://downloads.mongodb.org/osx/mongodb-osx-x86_64-2.4.tgz > ...
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1answer
877 views

Why is ZFS gzip-9 compression so much worse than actually using zip files?

I am working with some very large packet capture files (~150GB across 30 files) but because of how highly redundant packet captures are, these compress to ~7% (14.29x) of their originally file size ...
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1answer
40 views

Removind same *.tar.gz archives

I have crontab event archives to .tar.gz some folder every N hours. Finally I have collection of .tar.gz files. Now I want remove duplicating archives (created while target files stays unchanged) How ...
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50 views

Is there an older version of gzip that returns different/larger outputs?

I don't know how else to phrase this question, but I stumbled upon a file which I know from the header is gzipped (1F8B0800) but I am unable to recreate the file no matter what I try (including gzip ...
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1k views

One-click to create and extract .tar.gz files in Windows?

I'm using 7-zip latest alpha version (9.30) and I find it really inconvenient that, if I want to create a .tar.gz archive, I have to create a .tar archive first then add it to a .gz archive later. So ...
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1answer
5k views

Shell Script to GZIP files without overwrite .gz files

I'm trying to create a shell script which receive as first parameter of a path to a folder which I would like to compress all files using gzip without overwrite the .gz files that already exist in ...
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225 views

gzip many files one by one

I have 100 files, n1.txt, n2.txt,… and I want to gzip each of them, but not in one file – finally I'd like to have 100 n*.txt.gz files. How can I do that in Linux with Bash?
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zcat or gunzip: proceed on error

When trying to gunzip or zcat a large number of gzip files, zcat/gunzip will terminate with this error: gzip: <gzip-file>: unexpected end of file Is there any way I can get gunzip or zcat to ...
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When using “gzip --decompress”, the result is “gzip: MYFILE.zip: unknown suffix — ignored” on Windows

In Windows PowerShell (if it matters), I would like to decompress a zip file with gzip with the argument --decompress, but unfortunately it doesn't work. Please look at the screenshot below. gzip ...
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2answers
11k views

What command to use to unpack a .tar.gz file in Windows?

I use to receive tar.gz files fromm colleagues but unpacking them with 7zip is not convenient as it unpacks a tar file from gz first while I usually seek to get the tar file contents (so I have to ...
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2k views

Find out the size of a .tar.gz archive in the terminal without unpacking

I have a 32GB .tar.gz archive and I'd like to know the size of the files if I unpack this compressed archive. I'd like to avoid unpacking the archive first and than use e.g. du. Is it also possible ...
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Equivalent to tar's “--strip-components=1” in unzip?

I have a script that extracts a tar.gz-file to a speificed subdirectory mysubfolder: mkdir mysubfolder; tar --extract --file=sourcefile.tar.gz --strip-components=1 --directory=mysubfolder; Is there ...
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1answer
209 views

UNIX shell command to expand files of any compressed type

Is there any UNIX shell command to expand a compressed file which type is not known in advance? I should be able to use this command to expand at least any of the following types of files, though the ...
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1k views

pfSense iso.gz doesn't seem to be a compressed iso image

I downloaded the latest pfSense ISO (pfSense-2.0.1-RELEASE-i386.iso.gz) and had 7zip extract it, but it just shows me the disk contents. I cannot extract the actual ISO file to burn it with the boot ...
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656 views

Compressing bigger than 1GB files seems not to work

I tried my best to compress some videos, about 1.4GB each. I tried to compress them separately, "tarring" (using tar) them and then compress, everything. I'm on OS X Lion and I did try the ...
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How to obtain maximum compression with .tar.gz? [duplicate]

The way i understand the use of tar + gzip is that tar is normally used to consolidate a grouping of files into a single file, then gzip is used to compress that file. I recently learned that tar can ...
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1answer
461 views

How to zgrep by file pattern and timestamp?

I have a list of several thousand gzip (*.gz) files that I'd like to zgrep through, but I only want to run it on files with a last-modified-timestamp on or after yesterday (11/22/2012) and that ...
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106 views

Extract a section of a tgz file

I have a 28.5 GB .tgz file which was created on the command line of a Linux computer, compressing one folder and all its many many subfolders. I now want to extract a single sub-sub folder from that ...
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1k views

Estimate compressed file size in tar.gz

I've got a set of .tar.gz files, which are duplicity backup files (either full backups or incremental ones). I'd like to compute which directories take the most space on backups. This will most ...
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4k views

Is there a command to determine the compression ratio of a tar.bz2 file?

I have a file.tar.bz2 that's about 50GB and would like to extract it however I don't know how much space I will need. Is there a command to print the compression ratio of the tar.bz2 file?
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342 views

Enabling GZIP compression for Firefox RSS reader

I'm trying to view an RSS feed in Firefox, but am getting the following message. Your RSS reader does not support (gzip) compression. Is it possible to enable GZIP compression in the Firefox RSS ...
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1answer
2k views

General Compressibility Of Various File Formats [closed]

Has anyone come across list of which file formats generally compress well (in general algorithms)? Generally, text files .txt compress well, and media-files (.mp3, .avi, etc) do not compress well. ...
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3k views

Why doesn't Gzip compression eliminate duplicate chunks of data?

I just did a little experiment where I created a tar archive with duplicate files to see if it would be compressed, to my awe, it was not! Details follow (results indented for reading pleasure): $ dd ...
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335 views

Is it possible to recover partial compressed files?

Of the most popular compression methods (7z, RAR, Zip, GZip) is there any of them that allows to retrieve the uncompressed data from a partial file? Imagine there is only one compressed file, and it ...
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1answer
234 views

Winzip error / timestamp in file name related?

I receive an error when attempting to use winzip to extract a .zip file. The filename contains a colon character (used in the timestamp). Is this something that winzip does not handle? Also, the ...
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1answer
200 views

Looking for a gtk equivalent of ark

Does there exist a GTK equivalent (or improvement) of the Linux archiving tool known as Ark? If so, where might it be found; and if not, how well-received might be a new project which acts as a ...
2
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1answer
1k views

Zip/gzip compression ratio much less in Linux than in Windows

I have a bunch of very huge files located on a Linux machine that I would like to compress and save some space. I have tried using the tar/gzip combination and I have noticed that the compression ...
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474 views

How do I compress a directory?

Hey guys I was wondering how would I gzip 7z tar or just regular zip a directory like this /var/Backups/Tones regular gzip won't do it because Tones is a directory and this site ss64.com/bash doesn't ...
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1answer
912 views

Why my multiparted .tar unpacs just partly? (missing files)

I have 25 .tar files like: filename.tar.001 - filename.tar.025 When I want to unpack them with cat myarchive.tar.* | tar xvf - it does, but missing files: whole .tar is 1,2 GB, but unpacked files ...
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1answer
103 views

Guess compressability of a large file

I have a large file (~20 GB) and I want to quickly make an (approximate) estimate of how well it can compress. I want an program which can provide an immediate guess at the compressed filesize, and ...
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3answers
8k views

How to gzip a directory, transfer via scp, and decompress in one command?

I frequently transfer large directories over scp and it would be sweet if I could somehow compress the directory, send it, and decompress it all in one. Is something like this possible?
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1answer
150 views

Difference between caching & gzip for static pages

I have implemented all caching methods such as, memcache, diskcache, and also tried GZIP. Is there any source I can refer to which explains the difference between them. I tried memcache it is really ...
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5answers
9k views

Fastest GZIP utility

I'm looking for the fastest gzip (or zip) utility. I have a LVM volume which 95% exists out of blank 0's, so compressing that is very easy. I'm looking for the most fastest solution, and don't really ...