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Questions tagged [compression]

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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16 views

Steps to extract and repack ubuntu 18.04 initrd file

Can someone provide steps to extract and repack initrd file. Regards, Suresh K.
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1answer
57 views

Compress a folder to a .tar file in Ubuntu 20.04 via GUI

In the past, I had an option to compress to .tar file from Nautilus. How can I do that with Ubuntu 20.04? I did not expect new distros progress backward in features. I am not after a command line ...
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44 views

One tool that WORKS for all archives and compressed files

I have been using 7z, unrar , Peazip and Archive Manager and what not and I am having a hard time matching the compressed file/archive file with the appropriate tool for extracting. The default ubuntu ...
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1answer
36 views

What happened to e2compr?

Is it a part of the kernel now? Can I enable selective file compression for either ext2, or ext3, or ext4? chattr +c filename does not seem to work. I'm ok with custom kernels but it'll cause some ...
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1answer
56 views

Selectively exracting files from tar.gz file

I have a file data_backup_202.tar.gz whcih contains more than 400 files. Datestamp of those files goes back to 2010. I want to extract or decompress files for last 6months from this data_backup_202....
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25 views

Can't reproducibly split 7Z files with file-roller app?

I am aware that there is a command-line interface for doing this, but I prefer the graphical approach, not least because I can select individual files or folders more conveniently. If I were using the ...
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1answer
176 views

How can I zip a large amount of data based on a condition upon the size of the zip files?

I have about 2 TB of image data which I want to group into .zip files. The sizes of individual files vary. I want to put all these files into ZIP archives. Any .zip file cannot exceed 2 GB (1.8 GB for ...
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104 views

Imagify Error “Our server returned an error (0 - getaddrinfo() thread failed to start). I attached screenshot”

I installed plugins WordPress imagify and when I would like to compress image. I got 170 errors with Our server returned an error 0 - getaddrinfo() thread failed to start I attached a screenshot. ...
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1answer
111 views

Format-agnostic Zip Extraction Tool

I like being in the command line a lot for efficiency, but one thing I always end up using the GUI for is extracting compressed folders, because the command line tools for unzipping the different ...
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1answer
494 views

Mounting btrfs partition with compression enabled

I've got a btrfs partition on a SSD drive. This partition is not mounted by default, it's not root. It's just a plain data partition which is mounted on demand. Nothing fancy. The btrfs partition was ...
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1answer
222 views

Unpacking .lz format: what does this command do?

I'm trying to unpack Ubuntu Desktop's initial ramdisk (initrd.lz) to inspect some casper components. The lz format is indeed interesting, but what more surprises me is the unpacking method (that ...
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1answer
144 views

How to configure Krusader's extract context menu to use something other than ark?

I've found this context menu in krusader to be very unreliable over the years, it has hardly ever worked for me. Surely it's possible to configure the context menu to use a custom command, like simply ...
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471 views

Archive Manager: An error occurred while loading the archive

I'm recently getting this error when trying to open a simple zip file using file-roller aka Archive Manager. I've unzip, unrar and 7zip installed already. However, when I try decompressing the files ...
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1answer
100 views

Running out of hard drive space because compression is not happening quickly enough

I am downloading files (in parallel) which have a very large amount of data (fastq files) into a directory. I am running out of space quickly. So I got the following script (from here, modified ...
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1answer
32 views

How to zip a mobi file from the CLI?

Using tar works fine: thufir@dur:~/Desktop$ thufir@dur:~/Desktop$ ll total 9720 drwxr-xr-x 2 thufir thufir 4096 Jun 13 13:14 ./ drwxr-xr-x 48 thufir thufir 4096 Jun 13 00:46 ../ -rw-r--r-- ...
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2answers
125 views

Reduce mp4 size to send through email

I could not send a mp4 using Yahoo! mail because it took around 30 minutes. On Ubuntu MATE 18.04, I reduced the size using ffmpeg. ffmpeg -i sm_Julia1.mpr -s hd480 -strict -2  output.mp4 But the ...
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2answers
117 views

How to compress images without losing quality

I'm looking for a way to compress images in bulk without losing quality to improve the website loading speed. I'm working with surprisegenie.com and as it's a unique gifting platform so have so many ...
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1answer
56 views

Discrepancy in the size of compressed file

I was trying to compress a folder into .tar format. The folder size is around 76 MB. Suppose I want to compress the folder myfolder to my-compressed-folder (in tar format) I tried 2 approaches: 1) ...
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2answers
521 views

How to compress and download directory from remote to local?

I have a directory on my Ubuntu server that has many subdirectories and files. I want to download entire folder, so I used this command: scp -r myuser@mywebsite.com:/path/to/target_directory /path/to/...
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2answers
50 views

Compress folder following any symbolic links

I store a lot of my data in a flat structure and the create symbolic links to different folders where my clients can access them via OwnCloud. I need to compress one of these folders containing sym-...
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1answer
804 views

Difference between tar -tf vs tar -tzf

I am trying to list the contents of a tar file. I see that by combining -t and -f I can do so. It seems to work even for compressed archives. The combination of -z in addition with -tf also seems to ...
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77 views

Ubuntu 18.04 LTS Desktop Background Compression

I hope some of you can help. I recently took a nice photo and decided I would like it as my desktop background. The image is around 4000x2200 pixels and is in ratio with my monitor. When I view the ...
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1answer
61 views

Converting and size reduction of .m2t video for Flickr?

I have a .m2t video file that I would like to upload to Flickr. Can someone advise the best way to go about reducing the file size to <1gb and changing the file type to one that is accepted by ...
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42 views

Folder compression

In Windows there is an option to compress the folders to save disk space. This is done by right clicking the folder and selecting the Properties and then pressing the Advanced button Folder Properties ...
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5answers
20k views

How do I use an .img.xz file or get an .img file from it?

I have a file with an xz extension, ubuntu-19.10-preinstalled-server-arm64+raspi3.img.xz. How do you get the .img out of it? My goal is to flash the file on an SD card. I want to use www.etcher.io I ...
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1answer
2k views

Batch Compress Videos with ffmpeg

I have many videos in a folder, and I want to compress them all with one command. To compress one video I use: sudo apt-get install ffmpeg ffmpeg -i input.mp4 output.mp4 But what if I have many ...
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669 views

ubuntu tar.xz multi thread compression from nautilus

I tried to compress large file from nautilus compress menu (tar.xz). it takes huge time and i can see it use 1 thread from my cpu. I set the XZ_DEFAULTS environment variable to .bashrc but still it ...
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2answers
118 views

How to compress 3000 images in batches of 50

I have a folder with over 3000 images, I want to compress 50 of them individually and store them in tar files. The images are not serially named. How to use write a bash script which does this job?
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113 views

Unable to lock Zip file Ubuntu 18

I am trying to make a locked ZIP folder in Ubuntu 18.04. I followed this post, but it locked the files inside it and not the ZIP folder as a whole. I can open the ZIP folder without providing a ...
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1answer
916 views

Pstore decompression failed

I don’t understand what this error means. Can anyone help? I’ve seen a couple of forums with the same error, but none helped me resolve it. Pstore: decompression failed, ret = -22 ! Pstore: ...
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1answer
40 views

Problem with a front end of compressed files

I need to make a frontend for compressed files, the idea is that if you receive a gz or bz2 file, uncompress it with gunzip and bunzip2. If what you receive is a tar.gz or a tar.b2 you should unpack ...
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1answer
868 views

How compress rar with context menu nautilus

In Ubuntu 16.04 i right click folder and select compress type and split size but in 18.04 compress menu not like before and choose type menu in gone i install unrar zip unzip p7zip-full p7zip-rar rar ...
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1answer
1k views

“Compress” option disappears from right click menu when I search for a file on Ubuntu 18.10

I'm searching through a folder to compress a file for sending, and I've noticed that if I Ctrl+F and type the file name, or just begin typing the file name, then the option to 'Compress...' the file ...
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2answers
4k views

Compressing folder without using additional space on the drive

I have an 18GB EC2 instance that has run out of space. I wanted to zip and transfer files off the server to a local drive. There is just about 1% free space remaining on it. This means that I cannot ...
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399 views

Logstash does not compress the old logs

We are using: root@server:~# /usr/share/logstash/bin/logstash --version logstash 6.2.4 on: root@server:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu ...
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1answer
1k views

How to Open .001 .002 .003 and .r01 .r02 .r03 RAR Files

Is WinRAR the same as Linux rar? Additional features? Missing features? Special way of handling files? Software is available for Microsoft Windows (named WinRAR), Linux... -wikipedia The ...
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2answers
168 views

Why am I not seeing encryption as an option in file roller? [duplicate]

Ubuntu 18.04.1 LTS I've done: sudo apt-get install p7zip-full ...but when I launch file roller, I don't see any encryption options and the UI seems very basic.
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1answer
2k views

zram zstd support in 18.04

On ubuntu 18.04 I would like to use zram zstd compression but it is not available as it should be available in kernel 4.15.0-36-generic? As I understand it is a kernel compilation bug as described ...
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1k views

Not enough space in Ubuntu for extraction

I am using Ubuntu 16.04 I have to extract a 15 GB file which will decompress to around 62 GB. I have this file on NTFS partition with 134 GB free. But still, I am getting the error message " Not ...
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1answer
59 views

PNG Image Compression for Wordpress

Wordpress site getting heavier due to images , checked through google insights which states to compress images as its slowing down the site. There are many online venues but I need a opensource .deb ...
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1answer
842 views

How do I make nautilus use file-roller in Ubuntu 18.04 and above like in 17.04?

New nautilus is not using file-roller any more by default, it has switched to its native expression, but I want to use file-roller on right click. I found this answer, which worked in Ubuntu 17.10. ...
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1answer
2k views

Can I see the option tar.gz in the GUI ubuntu 18.04

I am trying to zip in .tar.gz in the GUI, but only these options appear in the window: .zip, tar.xz y .7z Could the tar.gz be in the window?
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1answer
49 views

Batch low quality compress +1TB of images and videos in multiple folders

I have over 1TB of images and videos spread across multiple folders (personal photos and videos, from the last 15 years) and I wanted to back them up but I don't need them to be stored in high quality....
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1answer
656 views

Reduce the file size of multiple .mp3s of voice recordings via command line at once

Problem: I have some mp3 files that take up way too much space. These mp3 files happen to be voice recordings, so they can be reduced in file size without a noticeable loss in quality. Specific ...
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2answers
303 views

CR2 Photos compressing from Windows 7 to Ubuntu

Right now I'm going to completely move to Linux. I need to move my photos from a laptop running Windows 7 to a PC running Ubuntu. I tried sending it via Google Drive (single file, ZIP archive, RAR ...
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1answer
4k views

make zram use lz4 compression algorithm

Ubuntu 18, trying to make zram to use lz4 compression. Tried modifying /usr/bin/init-zram-swapping file #!/bin/sh ........... ........... for i in $(seq ${NRDEVICES}); do DEVNUMBER=$((i - 1)) ...
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0answers
435 views

How do I restore `tar.gz` among the archive creation list? [duplicate]

Prior to Ubuntu 18.04, the compress dialog window listed a dozen file formats to choose from: In the new version, the dialog window offers only 3 options: This is somewhat limited in my opinion. I ...
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1answer
7k views

Compressing folder on aws instance creates a duplicate

I have a web app in this path var/app/current I use this command to zip everything including hidden files like htaccess zip -r yourfile.zip * .* It generates the zipped file which contains the web ...
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0answers
79 views

zip created by archive manager is smaller than one created by zip on command line

I am creating a zip archive of one file, in 3 different ways: zip -1 (least compression) --> 33.8kB zip -9 (most compression) --> 32.3kB archive manager (zip option) --> 26.1kB Why is there such a ...

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