The below example compares the differences between -0 and -9, as shown while -0 finishes much faster it compresses around 6% less (approximately 37mb more space required). Using option 9 will take longer to complete, however you will have the largest amount of space saved. Using option 0 will complete faster, but space saved from the compression will not be optimal. The level of compression applied to a file using xz can be specified as a value between 0 (less compression) and 9 (best compression). This only works for files that have a known size, it will not work if you are piping content into xz. In the below example we are compressing the Linux kernel with xz with -v which is showing us the current percentage, compression ratio, MB/s, elapsed time and estimated amount of time until completion which is very useful information especially when compressing a large file. The -v or -verbose flag can be specified to provide up to date information on a running operation. In this example, an xz copy of the Linux kernel has compressed to 14.4% of its original size, taking up 79.7MB of space rather than 553.9MB. Strms Blocks Compressed Uncompressed Ratio Check Filenameġ 1 79.7 MiB 553.9 MiB 0.144 CRC64 linux-3.18.19.tar.xz xz file such as the compressed and uncompressed size of the file as well as the compression ratio, which shows us how much space our compression is saving. With the -l or -list flag we can see useful information regarding a compressed. Similar to example 3, it is possible to decompress a file and keep the original. To reverse the compression process and get the original file back that you have compressed, you can use the xz command itself or unxz which is also part of the xz package.īoth of these commands will produce the same result, decompressing to file.txt, removing the compressed file. The -c flag outputs the compressed copy of file.txt to stdout, this is then sent to, keeping the original file.txt file in place. This can also be done with the -c flag as below. You can instead keep the original file and create a compressed copy with the -k or -keep flag. Compress a single file and keep the original To instead compress all files within a directory, see example 10 below. This will compress all files specified in the command, note again that this will remove the original files specified by turning file1.txt, file2.txt and file3.txt into, and
This will compress file.txt and create, note that this will remove the original file.txt file.
Speed up xz compression install#
We are going to cover 13 examples of xz here, showing you common tasks that can be completed and just how easy it is to use.Ĭheck out some of our other compression tool examples:īefore starting you will need to have the xz package installed, this is usually already installed by default, however you can install it now if required.ĭebian: apt-get install xz-utils Example XZ Commands With xz we will typically get a better compression ratio.
the python tarfile and bzip2 modules This also has the disadvantages of point 1.
Speed up xz compression zip#
The zip format is an example that would work. tar which allows you to compress on an individual basis, but this is unfavourable if you have lots of small files in one directory that have similar patterns (as they get compressed individually). you switch to some container format other than.Don't be confused by the options for the tar command to do the compression, tar -create -xz -file some.tar file1 is as "dumb" as knowing about the stream contents as doing tar -create file1 | xz > some.tar is. tar file, it doesn't know about the contents of the file, it just sees a binary stream, and whether parts of that stream are uncompressable, or minimally compressible, there is no way this is known. The way you are doing this, with compressing a.
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