Compression and archive format that stores one or more files into a single file, usually with a .zip file extension.

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4answers
6k views

Free commandline Zip utility for Windows? [closed]

I'm trying to create scheduled task for copying a directory tree containing a very large number of small files from one server to another. Copying the tree directly takes a couple of days, so I was ...
6
votes
3answers
245 views

When putting two identical files in a .zip, they take 2x space, can this be avoided

Say that you have a file you want to put in a .zip archive: zip a1.zip foo.dll My test .dll file is ~10MB, and the archive turns out to be 3.5MB Then you create a file with the exact same ...
1
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1answer
81 views

Compress / Zip a folder periodically but use minimal CPU?

Similar to this question except, I need it to run with minimal CPU on the background? Also, if there's a 7zip solution that will be nice.
0
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0answers
87 views

Have a self extract archive extract to specific folder

How can I create a self extracting archive that will extract the contents into a specific folder? Any program or method is acceptable on windows.
6
votes
6answers
2k views

How to split a zip file across INDEPENDENT volumes

I have about 12 GB of image tiles made up of about 2 million files. I'd like to zip these up to make transferring them to a server simpler. I just plan on storing the files in the zip files for ...
3
votes
4answers
322 views

Multiple [Stand-alone] zip files creation?

How can I automatically zip a group of files into multiple zip files (say, 2mb in size for each file), and that each zip file is a stand-alone zip file? (i.e. not mult-volume zip files, that you can't ...
0
votes
1answer
344 views

Using a .bat file to pull a string from a text file within a zip folder

So, please bear with me. This is only the second batch file I've ever written and my first post anywhere on StackExchange. I'm writing a batch file that tells a remote server to run HP Array ...
0
votes
3answers
76 views

Zip Icon changed to a blue 'A' associated with fontview.exe

I made the mistake of associating fontview.exe in the right click "Open With" window, trying to install a font from a zip folder in Windows 7. Now all my zip folders now have a blue "A" on them and ...
0
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0answers
33 views

Downloading files from zip and extracting suddenly extracts random things?

I recently downloaded a gmod map of 5 mb and I got like 70 gb left as storage. Now I tried extracting the map to the desktop and all of a sudden it says:"Cant extract, need 11.7gb to extract" So I ...
0
votes
1answer
65 views

intercept zip file download request to view contents?

user 'A' downloads a zip file from a web server via HTTP/HTTPS, and after downloading he immediately deletes that zip file from server. In this scenario,can user 'B' (not having direct access to ...
21
votes
4answers
3k views

Can Double Zipping Cause Problems?

I have a directory that I have been storing a ton of files in. Among the 10ish types of files there are also .zips of other directories. In my personal experience I vaguely remember issues when ...
34
votes
5answers
4k views

Why is a 7zipped file larger than the raw file? [duplicate]

Possible Duplicate: Why doesn't ZIP Compression compress anything? I tried 7zipping an .exe file but it actually became larger. Is this the expected result?
19
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2answers
13k views

Is zip's encryption really bad? [closed]

The standard advice for many years regarding compression and encryption has been that the encryption strength of zip is bad. Is this really the case in this day and age? I read this article about ...
-1
votes
2answers
170 views

Make a zip file, from string

I am downloading a zip file from the internet and I get it as a plain text string. I now want to save this to the disk, but how should I convert this text string to a file buffer? What is needed to be ...
3
votes
0answers
46 views

Compressed file with a header containing all files within it, at the beginning of the file

I have noticed that most files resulting from a compression / archive process do not have a list of the files contained at the beginning of the resulting file, but rather at the end of it. For ...
1
vote
1answer
53 views

How to unzip selected files of a zip file in Mac

I have some very large zip files contains thousands of files. I only need to unzip one or two files within it. In Windows, this can be easily done with most common programs like WinRAR or WinZIP. But ...
10
votes
2answers
61k views

How to crack a password protected zip file

I recently downloaded a piece of software that came in a .ZIP archive, but the .EXE software inside of the archive had a password on it. The website that I would have gotten the password from closed ...
3
votes
1answer
65 views

Is there any solution/utilities to compress and upload a large file simultenously?

Upload a large file via broadband connection takes time. Compress the file using max. compression ratio before upload also consume time. Is there any solution that may compress and upload file to ...
2
votes
1answer
72 views

ZIP will not extract all files on Debian

My machine runs Debian 6.0.7 and I have Zip 3.0 (July 5th 2008), by Info-ZIP. When I try to unzip a .zip file, 2~3 times out of 10 it would not extract everything. There would be 2-3 files missing. ...
0
votes
0answers
50 views

List contents of zip archive via stdin

Is there a "magic" way to list the contents of a Zip archive piped in via stdin? For instance: $ some_process_sending_files_in_one_zip_stream_to_stdout | gunzip -l - ... listing of files ... When ...
0
votes
2answers
421 views

How can I achieve the maximum zip compression? [closed]

I would like to make a "standard" zip file which contain .jpg images. Which software and switches / options should I use to achieve the maximum compression ratio? I mean maybe I can make a solid ...
3
votes
4answers
359 views

Why does zipping a zipped file not reduce its size?

Based on the idea that a zipped file is a new binary file, why can't I reduce a Zip's size by zipping it again and again – up to a very small resulting file?
6
votes
3answers
16k views

How do I create separate zip files for each selected file/directory in 7zip?

This is the internal zip packer from Total Commander: However I want to use my 7zip packer. When I select 5 files, I get 5 separate .zip archives for each selected file. How do I do that in 7zip?
0
votes
1answer
791 views

Recursively process zip archives to extract files while discarding specific format of files

On my Windows 7 machine, I have a directory full of downloaded dumps in ZIP archives. Each archive contains few text files, PDFs and rarely XML files. I want to extract all the contents of each ZIP ...
2
votes
4answers
659 views

How to split zip-file (or rar-file) in many files

I have a huge file I need to send over the Internet and I want to use SkyDrive but it has a 50MB limit per file. How can I zip and split my file in many small (50MB) ones?
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votes
2answers
46 views

Calculations for groups of data

I have 3 columns of data in an excel sheet. The first column represents zip codes, the second represents values in that zip code and the third column represents the frequency of that value in the zip ...
2
votes
3answers
2k views

Windows command line ZIP extraction with checksum or similar?

What I need to do, at the command line, is: Extract the contents of a a ZIP archive. Change an arbitrary number of the extracted files. Repeat step 1, but because it is a huge archive, only extract ...
0
votes
0answers
382 views

Cannot complete the compressed folder extraction wizard

Recently my friend archived a folder in linux (Redhat) and uploaded in Google Drive. I have downloaded the .zip file and trying in it to unzip in windows 7. I am receiving following error: Cannot ...
0
votes
0answers
24 views

Why would my zipped file be the same size as the uncompressed files? [duplicate]

I am trying to zip 13 mp4s. The uncompressed versions of those files are 2.69GB. But when I zip them with 7zip, using Ultra compression level and any of the compression methods - including LZMA, the ...
1
vote
2answers
276 views

Error when trying to extract files from a zip file

When I try to extract files and opening the zip itself I get this error: ! C:\Users\Loko\Downloads\Textbook_1.zip: Unexpected end of archive Some people say redownloading is the only fix but it ...
0
votes
2answers
91 views

How to use Linux zip to sync files

I want to "sync" my files to the zip, creating any new ones, updating any new ones, and the deleting ones from the zip that no longer exist. When I used -du, I see zip error: Invalid command ...
0
votes
1answer
50 views

Should I extract before running?

Is it not wise to run an executable from a zipped file without extracting first? Someone explained to me that there is no need to extract first. He explained that zipped files are nothing more than ...
3
votes
2answers
376 views

Specific password recovery [closed]

I have a zip folder which I saved and password protected. I forgot the password but I know that the password is something like : BlueMonday!2012 or bluemonday2012 I know I can brute force the file ...
0
votes
0answers
59 views

Fast way to forward an Outlook email as a zip

I need to find a quick way to select an email in Outlook 2010 and forward the email as a zip attachment. The recipient will always be the same. The subject and body of the email will always be the ...
0
votes
1answer
836 views

How to compress a large file to many smaller zip files with defined size?

I have a very large file, e.g. 100GB, and I want to compress it to many smaller zip file, with each file cannot larger than 1GB, what would be the most suitable commands to do it? remark: I want to ...
0
votes
1answer
28 views

How do I unpack .zip via FTP on Windows 8

I uploaded this .zip file using FTPRush to some FTP, now I need it to unpack, but can't figure out how. On FTPRush there's this command prompt when you click CTRL+R it's titled Send Raw Command to ...
5
votes
1answer
592 views

Change Excel Zip Compression Level in Windows

Excel compresses its files using Zip-Deflate and stores it. However, the compression level is far from the best. To reduce the size and send it across I have to unzip and re-zip it manually everytime. ...
9
votes
4answers
8k views

Is there a way to edit files inside of a zip file without explicitly extracting them first?

I sometimes need to make changes to a .zip or .jar file, so I usually move the file to /tmp, extract all the files with unzip, edit a few files, and then re-zip up the files. This works, but it can ...
1
vote
1answer
818 views

Fix corrupted Unicode file names in a zip archive

A colleague gave me a zip archive of some data I need to analyse, but unfortunately the filenames have been corrupted somewhere along the way, either when creating the archive or when extracting them ...
78
votes
2answers
35k views

What is __MACOSX folder?

What are these __MACOSX folders I keep seeing in zip files made by people on OSX? Some take as much as 30% of the file. What program are producing these __MACOSX folder and how can mac users avoid ...
0
votes
1answer
287 views

Extract specific folder from a tar.gz

I know this question was previously asked on this site before like here 1 and here 2 but no success for me. I want to extract the Measures folder from my S012011_csv.tar.gz zipped file. If I do tar ...
15
votes
3answers
47k views

What are the best options to use when compressing files using 7 Zip?

I often have to gather log files and upload them to a central server (Owned by another company). The central server has a size limit of the file, so I am trying to create the smallest file possible ...
0
votes
0answers
156 views

Windows 7 ZIP folders not extracting

I am helping a client who has a problem with Windows zip folders. For any zip folder, he can open the folder and see the contents, but if he does a copy and paste to a different location nothing ...
4
votes
2answers
9k views

Is there a simple, automated way to convert a large number of files between ZIP and RAR formats?

I have about 500 RAR archive files and 300 ZIP files that I want to burn to a DVD and give to someone else. I would like these 800 different archives to be in the same file format, so either 800 ZIP ...
1
vote
2answers
6k views

Opening a password protected zip file in Windows XP

My friend wants to send me an encrypted zip file that he created using $ zip -e file.zip file2.zip Will I be able to open that with the native Windows XP pk zip implementation?
0
votes
1answer
42 views

Move data with compression

I'm using win 7.I have disk ~2Tb which one I want to format so I need to move data from it to other disk, but the problem is that I have not another 2Tb disk and I think I can compress data(on the ...
6
votes
6answers
4k views

Zip files without compression

I'd like to bundle a number of big files into a single file, to make them easier to share. The files are already compressed (eg. jpeg, video etc), so I don't need compression, only archiving. How can ...
19
votes
7answers
16k views

How can I create a zip / tgz in Linux such that Windows has proper filenames?

Currently, tar -zcf arch.tgz files/* encodes filenames in UTF, so Windows users see all characters spoiled in filenames which are not english, and can do nothing with it. zip -qq -r arch.zip files/* ...
1
vote
3answers
5k views

Batch file to ZIP only files in directory or sub directory

I wanted to know if possible how to create a command line to do the following - if a directory exist ZIP only the contents into a ZIP file. If a directory has sub-directories ZIP only the contents ...
2
votes
1answer
282 views

Zip files and Volume Shadow Copy

I back a lot of data up using WinRAR and I create a .rar file from these backups. Since I back up about 20GB of data at a time this process takes some time. Sometimes I need to open a few of the ...