Compression is the process in which a file or folder's size is reduced by using an algorithm to encode the same information using fewer bits.

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Will mounting a btrfs volume with compress=no decompress already compressed data?

If not, how may the data be decompressed? Will defrag process decompress files?
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opening ar archive file

I'm trying to decompress that *.AR file using 'Archive Manager', it give me error msg Could anyone please help me to decompress the AR file properly? Thanks. ar file link
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0answers
10 views

Which type of tar compression has the best compression power? [duplicate]

There are many variations of the .tar compressed packages tar.bz2; tar.gz; tar.Z; tar.lz; tar.xz I want to compress: A series of text files video(s) I understand that the different types of tar ...
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2answers
37 views

Gzip compressed each files with .gz Extension how to revert back

I am trying to do a zip project folder and by mistake used gzip -r /project1. gz /project1 and it has been zipped each files with.gz extension how I can revert it back. Please advise. /app# ls ...
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1answer
30 views

What does “Compression Method : null(0)” mean in Client Hello?

As a task of my assignment, I used wireshark to capture packets. Now in Client Hello message, I saw compression method:null(0). Now I am confused what is that mean? Does that mean no compression is ...
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0answers
29 views

How to compress huge video files? [duplicate]

My Canon camera realize videos with the characteristics described in the picture. The problem is that those files are huge (1Gb for 2 minutes). Is there any application which allow me to compress ...
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0answers
40 views

How to apply lossy compression on a file/video using the command-line? [duplicate]

How can I apply lossy compression on a video using the command-line? When I use the default compression tool available in Ubuntu (ie. package the video into a tar.gz, zip, etc. file), I don't get ...
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2answers
232 views

Confusion between archiving and compressing?

I am confused about archiving and compression and I am going to write what I think is correct. Here are the commands that I wish to get a better understanding of: tar –c file > file.tar tar –cf ...
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1answer
67 views

How to list compression ratio on compression enabled btrfs?

I enabled compression on a btrfs volume. Now how do I know the compression ratio of files or directories? Or at least the overall stats?
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0answers
38 views

Display all images using next arrow from a compressed file(zip or rar )

Is there a way to display an image from compressed file(zip or rar file) and then press next arrow to display the next image in that compressed file (zip or rar file). In both cases(where we have a ...
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0answers
32 views

Can't record in high quality

I finally gave up on SimpleScreenRecorder for many reasons, and I'm now trying to use OBS. It seems like it works much better, but I can't figure out how to configure it correctly. There are very few ...
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1answer
67 views

unable to compress some hidden folders of old OS

I am trying (in Ubuntu 15.05) to compress some folders related to my older versions of OS (Ubuntu 14.10). If I try to compress these folders with "right click > Compress" it gives following error: ...
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1answer
67 views

How can I check a compressed file for reliability?

I have a 5GB folder with my research from last year. To save space, I compressed the folder, and all its contents. The compressed file *.tar.xz, is 761MB, which seems really tiny. That made me wonder: ...
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1answer
67 views

Compress files menu: password grayed out

I am trying to password protect a compressed file, but the option to do so is greyed out. I am using Ubuntu 14.02 Mate. How can i password protect a compressed file?
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1answer
3k views

How to unpack file with a .pak extension?

I would like to unpack a .pak file on Ubuntu 14.04. How should I proceed?
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3answers
491 views

Compress folders older than x days

In /opt/abc I have a path where a new folder gets created daily. In that folder a series of files gets created. I would like to run a script every Sunday at 02:00 and compress each folder which is ...
0
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1answer
120 views

Linux: compressing pdf with GS is very slow?

I am compressing large PDF files (+10 MB in size) with GS using the following snippet: gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH ...
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2answers
165 views

Error when extracting lzma tar ball in terminal tar : “Unexpected EOF in archive”

xz: (stdin): Unexpected end of input tar: Unexpected EOF in archive tar: Unexpected EOF in archive tar: Error is not recoverable: exiting now What does this mean? What I entered: sudo tar --lzma ...
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1answer
134 views

backing up and compressing /home directory using lzma

Will this work? sudo tar -cvpf backboxhome.tar.gz/home/user --lzma I am mainly confused on where to place the --lzma argument.
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1answer
40 views

Creating an archive fast

I have a big folder with hundreds of thousands of files. Total size is 10GB The idea is that I want to archive this folder so I can transfer it to another server faster than file by file. I tried ...
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1answer
197 views

Can't unzip compressed files - Ubuntu 15.04

So, here's what I'm faced with atm: I am unable to unzip any type of compressed files - 7z, tar, bz, zip, rar, etc. I've tried in front-ends (nautilus and PCMan) and terminal (unzip, tar, etc) and ...
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2answers
128 views

Archiving a lot of files / one big file

I want to compress about 100'000 files (that's what find . -type f | wc -l says) with a total disk usage of 100 GB. Most of the files are small but just a handful of them makes up about 70 GB of the ...
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3answers
2k views

How do I compress multiple files into a .xz archive?

I want to compress several images into a .xz archive. How do I do that?
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0answers
222 views

How to uncompress vmlinuz

I have extracted a 14.04 iso file. How would I decompress vmlinuz and then compress it back?
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42 views

Achieve manager like view of compressed files in Terminal [duplicate]

If I can, I will avoid using the GUI to get around my system, and recently what I have found very annoying is that I seem unable to view the contents and open the contents of a compressed file without ...
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1answer
105 views

ntfs-3g Failed to decompress file

For years the logs of my Ubuntu systems sharing drives with a Windows installation have been routinely flooding logs with: Mar 17 11:00:50 kemosabi ntfs-3g[483]: ntfs_attr_pread error reading ...
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1answer
154 views

Which subdirectories of / should have compression disabled in btrfs root filesystem?

Imagine you set up your root filesystem to be btrfs with Ubuntu 14.10 defaults (one subvolume for / and one for /home) and you want to compress and deduplicate as much as possible. Which directories ...
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1answer
118 views

How to batch compress folders?

I want to batch compress folders, I want the format to be 7zip and of course I want to preserve the name and get the .7z extension at the end.
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1answer
237 views

Cannot open AR archive file!

I have compressed couple of files and folders (mostly photos) using 'Archive Manager' on Ubuntu 14.04. During compression I've selected file type as AR from the drop-down selector. Now when I'm ...
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1answer
242 views

How to Compress (More than one at a time) PDF files from terminal

I work with lots of rather large imaged documents ranging from a few bites to multiple gigs of data per file. I need these documents to take up less storage space and especially to be more ...
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1answer
411 views

Zcache Usage in Lubuntu

Recently I appended zcache to my grub configuration: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash zcache" But I am at a loss as to whether zcache is working or if I need to do something else. There is ...
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1answer
233 views

How can I archive dd's output directly possibly without using any compression?

It has been determined already in this question that tar cannot read input from stdin. How else can a dd output be archived directly possibly without using any compression? The purpose of doing ...
8
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1answer
2k views

Set 7z compression level using GUI in Ubuntu

Archive Manager, or file-roller, doesn't seem to have the option to set the compression level for 7z files. However, the windows client 7-zip has an option to do so using GUI - On Ubuntu/Linux, ...
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1answer
202 views

Mounted btrfs will [not] compress?

I have a partition formated to btrfs and im willing to store there stuff that I don't use that often but which I need fast access from time to time (some dumps of my PS2 games for now) because I have ...
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1answer
19k views

Compressing a folder (tar) without its containing directory in the foldername

I am trying to compress a folder with tar command. When i trying to compress it , it works fine the problem is with the file name. source path : /data/file/ destination path : ...
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2answers
156 views

Lossless Compression using rsync

When using the -z mode to compress data when running rsync, is the compression lossless? sudo rsync -az /path_to/A /path_to/B How can one ensure that any compression would be lossless?
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3answers
4k views

Linux/Ubuntu native (not Wine) alternative to DVD-Shrink, that can compress a DVD image to a smaller size to fit on a writeable DVD?

An alternative to DVDShrink would be a program able to shrink a DVD movie to a smaller dimension that would fit a standard 4.7 dvd while optionally keeping the dvd-movies structure, menus etc. (that ...
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2answers
271 views

How can I compress multiple pairs of files into separate archives by name?

I've got a couple dozen sets of Audacity project folders and .aup project files whose names are very close, i.e. 10-13-14-data and 10-13-14.aup. I'd like to compress all of these files automatically ...
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1answer
5k views

How To Zip An Archive Without Including Parent Directory

Help Please I want to zip many folders and their directory tree is like so V- something.txt folder folder g.jpg h.jar Now Whenever i try to zip it it ends creating a zip archive with the v ...
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1answer
336 views

How to compress syslog-ng's network link, now that zlib is disabled in openssl?

In our servers infrastructure, for logging, we use a client/server setup, using syslog-ng, and stunnel as a mean of compression at the network level, through zlib at the SSL layer (syslog-ng doesn't ...
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3answers
151 views

can't compress whole file with tar?

I'm not an expert with tar (xz) but I have a video (FLV) and it's size 95MB I would like to compress it and I was using this command XZ_OPT=-9 tar -Jcvf myfile.tar.xz 1.flv (I got this from a ...
0
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2answers
2k views

How to convert the iso file into rar or zip or tar?

Is there anyway to extract iso or convert that to zip or rar or tar file? actually I have a big iso file on my remote server so I just want a file from it not all of that, unfortunately I have not ...
1
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1answer
7k views

7z “ultra” settings for zip format

7z "ultra" settings for .7z format are: 7z a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on What are the "ultra" settings for .zip format (using 7z)?
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1answer
1k views

7z “is not supported archive” while updating an archive

While updating an archive we are getting this error: $ 7za u -pPasswored -mhe=on -r -m0=lzma -mx=9 -mfb=64 -md=32m '-x!temp' filename.7z /home/software Error: XXXXXXX.7z is not supported archive ...
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2answers
3k views

btrfs for deduplication and compression at the same time?

I'm thinking about using btrfs functions for both deduplicate and compress my storage... My question is: is it efficient? I mean, does it deduplicate AND compress at the same time efficiently?! I'm ...
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0answers
171 views

snzip via apt-get?

The snzip is a data compressor, based on the Google Snappy library. I've found and installed the library itself via apt-get: sudo apt-get install libsnappy-dev but it doesn't include the command ...
0
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1answer
125 views

compressed block device

I wanted to experiment with combining bcache and a compressed block device on a hdd and seeing if this will speedup the boot time. Are there any means of compressing a block device at the block level? ...
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5answers
4k views

What is the difference between different “compression” systems?

I've always used TAR and ZIP for compression, but recently I have heard about the *.Z compression algorithm. This brought up a question for me: With all of these compression systems, which one is ...
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2answers
159 views

Command/App to convert video files [duplicate]

Anyone know how to batch convert multiple video files into smaller sizes?
2
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1answer
74 views

Compressing many folders

I have a directory containing plenty of folders as well as compressed files. I need to compress the folders that are not already so (tar -cvzf ...) but have no experience in sh scripts. Can anyone ...