Compression makes files smaller in size, normally done to reserve space, archive old files or to reduce network bandwidth required while transmitting file
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5answers
26 views
Any method to batch-compress multiple files?
Does anyone know how multiple files can be GZIP compressed?
I have lots of files in a folder and I need to compress them individually.
Actually, I've found a way to do it. GZIP command line binary ...
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1answer
67 views
Is there a uncompressed format to PNG?
As we know PNG image format being the lossless format for image files. Compared to lossless audio file formats such as FLAC for example: When I decompress it, I get uncompressed .WAV file format.
So ...
2
votes
2answers
49 views
Modern command line file compression utilities
I am frequently moving large files around from server to server.
UNIXes comes with standard gzip and bzip2 compressors. However, what open options there exist beyond these, especially ones utilizing ...
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3answers
56 views
Is there better compression than RAR? [closed]
Possible Duplicate:
Compressing with RAR vs ZIP
As many will know, the RAR format produces consistently better results than ZIP. I've used RAR happily for many years and it's really ...
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1answer
19 views
Exctract files to a different folder
On a Windows XP machine, I have a zip file located on "c:\temp\mydata\okidata.zip"; using 7-Zip application, I would like to write a batch script and extract the file silently to the following ...
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1answer
13 views
How does the CentOS/Linux zip utility handle files that are changed during compression?
Question says it all: I have a directory that I want to 'zip -rv' up, but the files are changing all of the time (postgres database base backup). Will this break zip, or will it continue with a ...
3
votes
1answer
100 views
Compressing a file in place - does “gzip -c file | dd of=file” really work?
In the question How can I compress a file on Linux in-place, without using additional disk space?, one answer proposes to simply use
gzip -c file | dd of=file
I tried it (on Debian Linux), and it ...
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1answer
50 views
How should I compress my network traffic? How to make my connection 'faster'?
I have a slow ADSL currently, which could really benefit from some compression. I've also got servers in the country, with a very low ping (0, 1ms to the my ISP).
Which software, 'solution' should ...
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4answers
132 views
How can I compress a file on Linux in-place, without using additional disk space?
I've got a 100GB drive that has a 95GB file. I need to free up some space on the drive (and right now transferring the file off the drive is not an option). The file would compress well with gzip or ...
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3answers
59 views
A compression (online) service?
Mysteriously, our connection is now very slow (10 KiB/s),
so it takes a very long time to download large files (>= 900 MB).
I'm searching for an online service that will:
Download the original file ...
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0answers
37 views
How does cluster size affect NTFS compression ratio?
I read that NTFS compression needs a patition formatted with an allocation unit size <= 4KB.
How can the cluster size of a partition affect the ratio of NTFS compressed files? For example, a ...
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2answers
52 views
Create multiple zip files that are not dependent on each other?
I want to compress a folder into multiple zip files of 50MB each but don't want them to be dependent on each other. When I use Winzip and use the split feature it creates one zip file and the others ...
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0answers
44 views
Why does Acrobat X Pro show documents blurry briefly after compression?
I am using Adobe Acrobt X Pro and utilize the tool under document processing labeled "Optimize Scanned PDF". When doing so, it always warns me:
Acrobat has detected a page that is already optimized. ...
0
votes
1answer
67 views
Is it safe to compress my Windows 7 %USERPROFILE%\AppData folder?
Having just read Scott Hanselman's latest blog entry, Guide to Freeing up Disk Space under Windows 7, he suggests turning on NTFS compression which I already do for a number of less travelled folders ...
17
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2answers
1k views
What do the numbers 240 and 360 mean when downloading video? How can I tell which video is more compressed?
I have downloaded some computer science lectures from YouTube recently. There is usually more than one choice of file size and file format to download.
I noticed that for the same video, the ...
2
votes
3answers
136 views
How do I convert tar.bz2 to tar.gz?
I'm new in Linux, is this conversion possible?
Do I need to compress and decompress all content?
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2answers
262 views
Can compressing Program Files save space *and* give a significant boost to SSD performance?
Considering solid-state disk space is still an expensive resource, compressing large folders has appeal. Thanks to VirtualStore, could Program Files be a case where it might even improve performance?
...
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2answers
124 views
Why do bzip2 and gzip corrupt large heapdump files and can I work around it?
I'm trying to analyze heap dumps from a server which are fairly large files (10-15 GB). I create those files on the server and want to analyze them on my machine, so for downloading them, I tried ...
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1answer
33 views
Unzip delete and unzip
I am having an issue with commad line unzip and am not sure how to correct this.
I am unzipping a compressed file and it processes it correctly. If the zip file should have some files removed and it ...
0
votes
1answer
77 views
If I use “compact” to compress a NTFS drive, how can I avoid compressing compressed files?
The following command compresses an entire NTFS drive:
compact e: /s /c /i
How do compress an entire drive, ignoring previously compressed files (in particular, .zip, .rar and .tib)?
Compressing a ...
2
votes
3answers
164 views
If you switch NTFS compression on, why is the CPU load so low? Does it use SSE4.2 instructions behind the scenes?
I have a Hex-core Xeon X5650 running Windows 7 x64.
I'm currently doing simultaneous compression of three NTFS hard drives, 2TB each, with the commands:
compact e: /i /c /s
compact f: /i /c /s
...
2
votes
3answers
60 views
How do I create a Windows XP compressed folder in Winzip?
When you create a compressed folder in Windows XP it appears to be a standard zip file but it's not. That said WinZip 9.0 (dated 2004) can read it. However the Windows XP compressed folder support ...
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1answer
47 views
compression for large Maildir structure
I run a Debian Linux mailserver for a few little companies that stores its emails in a Maildir structure and therefore each mail as a seperate plain text file.
Altogether these files are as large as ...
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0answers
20 views
IIS vs httpZip (or other product) Compression
We're currently comparing httpZip compression software. Has anyone used this and can offer a comparison between that product and IIS? Is there a big savings for httpZip over IIS? If you aren't ...
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2answers
133 views
How do I use 7-Zip for Windows to create .tar.gz archives?
How can I use the 7-Zip CLI (7za.exe) on Windows to create .tgz archives, as I use tar zcvf archive.tgz source_files on Linux?
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1answer
14 views
copying a directory tree to another location, with optional compression
What I want to do is to copy a directory to anther position (on Linux), and compress some files (with a certain extension) with GZip on the destination, while other files are just copied. Could this ...
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2answers
86 views
Piping in and out of tar and gzip
I am trying to get a handle on how to pipe from a command into something like gzip, cpio or tar.
The commands in question belong to the ZFS system. I am running ZFS on Ubuntu Linux 10.04.3.
The ...
2
votes
1answer
105 views
How can I compress multiple files into three files per archive with 7-Zip?
I have 100 files that look like this:
001.txt
002.txt
003.txt
004.txt
.....
100.txt
I want to compress them like this:
001.txt
002.txt ----> archive01.7z
003.txt
---------
004.txt
005.txt ...
2
votes
4answers
130 views
What are the most popular file extensions for COMPRESSed files? [closed]
I was just wondering, what's the difference between these file formats? Shouldn't there be just one or two that generally tend to perform superior to most others?
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3answers
104 views
Hash of 7zip archive of a SVN export changes even when the files don't change. Is this by design?
I'm writing a powershell script that does the following
Does svn export of a subversion repository to a temp folder
Zips the contents of the temp folder into a 7z archive
Compares the md5 hash of ...
6
votes
3answers
177 views
How to do “Files to store without compression” in 7-zip?
Is there any way to selectively prevent certain file types from compression in 7-zip, like in WinRAR?
I'm trying to compress a huge folder (many gigabytes), and I don't want the already-compressed ...
4
votes
1answer
85 views
Auto self extract archive with password…Is it possible?
Is it possible to make an password protected SFX archive (non GUI) and extract it by giving a password via command line ?
Do any of the archive formats support this ? I couldn't find any.
...
5
votes
1answer
341 views
Why does compressing and decompressing my SSD hard drive free up space?
I bought an SSD (SandForce 2), created a tiny 25GB partition on it for Windows and installed Windows 7 64-bit. In order to free disk space, I enabled compression on the drive using the Properties ...
4
votes
2answers
195 views
Which compression program/algorithm produces the smallest archive file?
I have a directory full of avi files. I'd like to compress this directory into an archive of the smallest possible size. What compression software would produce the smallest archive file?
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1answer
79 views
How to safely zero fill a file in a compressed filesystem in Linux?
I had read that the shred doesn't safely work for compressed filesystems when shredding a file, how this can be accomplished in a compressed fs ?
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3answers
72 views
Arrange JPG images based on JPG compression/quality
I have been looking for a way to arrange JPG images based on the quality/compression level of the images.
I want to do this so that I could select only those images which has less compression (let’s ...
2
votes
1answer
28 views
How do I compress multiple videos for the web using a Mac?
I'm uploading some videos to Google + and it's taking forever! So I'd like to compress the videos so they don't take so long to upload. I am aware that quicktime has a compression feature to upload ...
0
votes
1answer
31 views
Software for lowering the colors in PNG-24 files
I am searching for a software that will allow me to reduce the number of colors for PNG-24 transparent (as in photoshop) files. Photoshop doesn't allow me any control over the amount of colors the PNG ...
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votes
0answers
23 views
Zipping files which contain multilanguage characters in filename using the 7za tool
I am using the 7za tool to zip some files which contain multi-language characters in the filename.
But after doing compression these filenames are rendered as junk letters.
Is there any way we can ...
3
votes
2answers
201 views
Does the RAR compression algorithm compress better than the ZIP compression algorithm?
I took 3 test files and ZIPped them. With the 3 test files again I RARred them. Each .RAR archive is smaller than the corresponding .ZIP archive.
Does the RAR compression algorithm give a better ...
0
votes
1answer
376 views
How can i compress when I create SQL backup file in a folder?
I use SQL Server Express and I create backup files for all databases every day using Time Scheduling script. One script Like that;
BACKUP DATABASE [Jira]
TO DISK = N'C:\Backup\Jira.bak'
WITH ...
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vote
2answers
184 views
Linux: Compressing files despite low disk space
I use Linux. I coded a screenshot program some time ago and now I have 9 GIG of screenshots, 60000 JPEGs, most of them look pretty similar, and I have 300 MB of disk space remaining.
What are some ...
4
votes
1answer
59 views
Tar - split files
i am using the following command to backup and sql file:
tar -zcvf "$BACKUP_DST/$FILE_NAME.tgz" "$BACKUP_DST/$FILE_NAME.sql"
i want to make sure the compressed file wont be larger then 300mb, if it ...
19
votes
6answers
863 views
How can I evaluate the best choice of archive format for compressing files?
In general, I've observed the following:
Linux-y files or tools use bzip2 or gzip for distributing archives
Windows-y files or tools use ZIP for distributing archives
Many people use 7-Zip for ...
3
votes
3answers
803 views
How to specify level of compression when using tar -zcvf?
I gzip directories very often at work. What I normally do is
tar -zcvf file.tar.gz /path/to/directory
Is there a way to specify the compression level here? I want to use the best compression ...
0
votes
1answer
111 views
Best archive format & tool for large amounts of data (50gb+)
I only realised this afternoon that the ZIP format has a limit of what appears to be around 20gb. I am trying to automate an archive process (using Automate) to zip/rar/whatever a collection of ...
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votes
0answers
599 views
What is alternative to Opera Turbo for Firefox?
I want to use something like Opera Turbo on Firefox.
I want such service to be secure, so it does not collect information about me
it should be encrypted
Thanks:)
4
votes
2answers
117 views
Unix/Linux program that can handle all popular compression/archiving formats (e.g.tar, gzip, bzip2, zip)?
I sometimes get confused by the varying command line options I need to run common Unix archiving and compression software (e.g. gzip, bzip2, zip, tar).
Is there a program out there that can just Do ...
0
votes
2answers
190 views
How to optimize ZIP files for size?
I have a ZIP file (created by Info-ZIP on Linux) and I want to make it as small as possible. I have lots of CPU time to burn on the recompression. I already know advzip, and it managed to reduce the ...
2
votes
2answers
387 views
What is the fastest compression method for a large number of files?
I need to compress a directory with around 350,000 fairly small files that amount to about 100GB total. I am using OSX and am currently using the standard "Compress" tool that converts this directory ...
