bsdtar : jcf and --use-compress-program-bzip2 produce different files

Posted by Valerio Schiavoni on Server Fault See other posts from Server Fault or by Valerio Schiavoni
Published on 2013-10-21T08:49:11Z Indexed on 2013/10/21 9:58 UTC
Read the original article Hit count: 318

Filed under:

tar

|

compression

These two commands produce files that are slightly different in size. In particular:

tar --use-compress-program=pbzip2 -cf old_logs.tbz2 1tree_* 4tree_* 8tree_*

The file old_logs.tbz2 is 100557548 bytes large.

The command:

tar jcf old_logs.tbz 1tree_* 4tree_* 8tree_*

produce the file old_logs.tbz that is 98783046 bytes large.

Where the difference in the two files originate from ? I'm using bsdtar 2.8.3 - libarchive 2.8.3 on mac osx 10.8.5.

© Server Fault or respective owner

Related posts about tar

Extract tar with multiple tars inside?

as seen on Server Fault - Search for 'Server Fault'
Is there a way to untar a file with multiple tars inside? It's suppose to just untar everything inside including untarring the tars inside the tar... With windows it does it, quite annoying I can't figure it out on linux... Here is what I am doing: # tar -xvf socialengine4.0.5p1.tar core-base-4… >>> More
TAR command to extract a single file from a .tar.gz

as seen on Server Fault - Search for 'Server Fault'
Does anyone have a command syntax for extracting 1 file from a .tar.gz that also allows me to place the extracted file in a certain directory? I have Google'd this and get too many variations with a lot of forum threads stating the syntax doesn't work. Before I venture on I prefer to know the command… >>> More
tar fails to open .tar file on OS X

as seen on Super User - Search for 'Super User'
I need to unarchive a file to the /Developer folder. My file is in /Users/User/Desktop/VMware/Downloads And I am trying tar -xf qt-everywhere-ios-4.8.0-arm7-nossl.tar.gz -C /Developer and keep getting: Lions-Mac:Downloads User$ tar -xf qt-everywhere-ios-4.8.0-arm7-nossl.tar -C /Developer tar:… >>> More
Zero sized tar.gz file found inside a tar.gz file

as seen on Super User - Search for 'Super User'
My current directory contains a single file like this- $ls -l -rw-r--r-- 1 root staff 8 May 28 09:10 pavan Now, I want to tar and gzip this file like $tar -cvf - * 2>/dev/null |gzip -vf9 > pavan.tar.gz 2>/dev/null (I am aware I am creating the zipped file in the… >>> More
MinGW tar compression problem

as seen on Super User - Search for 'Super User'
I am unable to get the Mingw tar to work with compress files. It does not filter through the proper compression utility. However, tar will work if I manually uncompress the file first. I have tried in both the MSYS shell and Windows cmd. Has anyone had this problem or is it a MinGW bug? For example… >>> More

Related posts about compression

Converting linear colors to SRGB shows banding in FFmpeg

as seen on Super User - Search for 'Super User'
When I convert an EXR file sequence with x264 using FFmpeg and convert the colorspace from linear to SRGB (with gamma 0.45454545) I get some heavy banding issues (most visible on a dark gradient). Here is the ffmpeg command I use: C:/ffmpeg.exe -y -i C:/seq_v001.%04d.exr -vf lutrgb=r=gammaval(0… >>> More
IIS7 Compression CSS files only compressed when dynamic compression is enabled

as seen on Server Fault - Search for 'Server Fault'
If anyone can help it would be appreciated. I would like to enable compression for static files within IIS7 (for the sake of simplicity I'll just refer to static css files for the time being). The problem I'm getting is that css files are only compressed when both dynamic and static compression… >>> More
Built-in GZip/Deflate Compression on IIS 7.x

as seen on West-Wind - Search for 'West-Wind'
IIS 7 improves internal compression functionality dramatically making it much easier than previous versions to take advantage of compression that’s built-in to the Web server. IIS 7 also supports dynamic compression which allows automatic compression of content created in your own applications (ASP… >>> More
Domino Document data compression and design compression

as seen on Server Fault - Search for 'Server Fault'
I was thinking of turning this on some large databases not just mail files - we have around 8 - 10GB of large databases as well as small databases of couple of hundred MB in size. But after reading this post I am not too sure: http://www-10.lotus.com/ldd/nd85forum.nsf/4b9931b774db788c85256bf0006b5e6d/1f4e67b569720e54852576c0003cb8ac… >>> More
I need to choose a compression algorithm

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to choose a compression algorithm to compress some data. I don't know the type of data I'll be compressing in advance (think of it as kinda like the WinRAR program). I've heard of the following algorithms but I don't know which one I should use. Can anyone post a short list of pros and cons… >>> More