$ rar a -r -rr10p -s -m5 -msjpg mp3 tar /media/data/darkhorse-backup.rar /home/darkhorse
#RAR FORMAT ARCHIVE#
This way up to 10% of the compressed archive can become corrupt or unusable, and it will be able to recover the data through parity. Recurse subdirectories (includes all dirs/files under the parent directory).Īdds recovery records to the archive. $ rar a -r -rr10p /media/data/darkhorse-backup.rar /home/darkhorse Task: backup /home/darkhorse to /media/data/darkhorse-backup.rar using 10 % recovery records:.Recursively compress an entire directory structure RAR compression examples General syntax $ rar command - switch 1 - switch N archive files.rar a complete listing of commands and switches, see the last section of this article or simply run rar.
#RAR FORMAT MP4#
Switches=-m5 -rr5p -ol -s -md64 -msmp3 mp4 avi mkv zip 7z rar tar gz bzip2 zst jpg jpeg gifįor a complete listing and explanation of rar's switches, see rar(1).
The syntax of the file is simply the following string: in the user's home directory) or if you wish to define a global set of options for all users, in the /etc directory. RAR for Linux reads configuration information from the file ~/.rarrc (i.e.
#RAR FORMAT INSTALL#
Alternatively, install unrar for just UnRAR. Install the rar AUR package for both RAR and UnRAR. In newer versions, password protection can optionally protect filenames too, so that the filenames contained within the archive will not be displayed without the right password. The only known ways to recover an encrypted file are via dictionary or brute force attacks. Older versions of the file format used a proprietary algorithm newer versions use the AES encryption algorithm, a block cipher adopted as an encryption standard by the U.S. Most currently used compression formats (with the exception of the older ZIP) allow solid structuring.
Built-in support for multi-volume files enables the unpacking program to simply prompt the user for the next. RAR is able to efficiently handle split volumes.On its own, Tar does not have this ability. Even if parts of an archive are damaged, it is possible to fully recover the stored data if a large enough recovery record exists. Variable amounts of redundancy ("recovery record" or "recovery volumes" both of which are demonstrated below) can be added to an archive, making it more resistant to corruption.A trial version is available, so you can try WinRAR before buying.
#RAR FORMAT ZIP FILE#
It can backup your data and reduce the size of email attachments, open and unpack RAR, ZIP and other files downloaded from Internet, create new archives in RAR and ZIP file format. Note: Answer was posted after receiving confirmation from the WinRAR developer that the technical analysis was sound.WinRAR is an archive manager. However, since this is such an uncommon requirement I'm pretty sure no program already exists that can do this, so you'll have to write one yourself or wait till someone does so. Of course you can always extract and recompress only the required files as a new archive.įinally, like I said above if solid archiving wasn't used a new archive with only the required files can be created without decompression. If you might need some of the files later you can copy the source archive and then follow option 1. If solid archiving wasn't used no decompression and recompression will be required. If you don't need the 50k files you can delete them directly from the source archive. if you delete files from a non-solid RAR archive it does not decompress the data in any way, though of course temp files may be used for safety. The process should be similar to this one for ZIP files, suitably adjusted for the RAR format of course.Īlso, I'd like to note that WinRAR already does this to some extent, i.e. Looking at the RAR archive format, if solid archiving and encryption are not used it is possible to create a new archive with a modified main archive header and only the required file records (file headers, data blocks, service headers etc.) copied over without the data blocks needing to be decompressed first. What you're looking to achieve is technically possible with certain caveats. I'm going to have to disagree with the other answers posted so far.
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