With the -v or -verbose flag we can see useful information regarding the compression ratio of a file, which shows us how much disk space our compression is saving. 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 bzip2 command itself or bunzip2 which is also part of the bzip2 package.īoth of these commands will produce the same result, decompressing 2 to file.txt, removing the compressed 2 file. The version of bzip2 that I am testing with, 1.0.6, which is currently the latest available as of this writing also has the -k option which keeps the original file, so alternatively you could also run the below command to get the same result. The -c flag outputs the compressed copy of file.txt to stdout, this is then sent to 2, keeping the original file.txt file in place.
You can instead keep the original file and create a compressed copy. Compress a single file and keep the original To instead compress all files within a directory, see example 7 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 2, 2 and 2 This will compress file.txt and create 2, note that this will remove the original file.txt file.
Tar compress bz2 install#
We are going to cover 10 examples of bzip2 here, showing you common tasks that can be completed and just how easy it is to use.īefore starting you will need to have the bzip2 package installed, this may already be installed by default, however you can install it now if required.ĭebian: apt-get install bzip2 Example Bzip2 Commands It may be preferable over gzip as it can produce smaller compressed files, at the cost of additional memory and processing time. Bzip2 has been around since the late 1990s and is still widely used today. If you are concerned about speed, you could investigate alternative algorithms, such as those used by gzip or lzop.Bzip2 is used to compress a file in order to reduce disk space, it is quite popular in Linux and UNIX operating systems for this reason.
tar.bz2 īzip2 uses a slow compression algorithm. So to use that with tar, you could for example do: $ BZIP2=-1 tar -create -bzip2 -file. This gives a convenient way to supply default arguments. In that order, and will process them before any arguments read from theĬommand line.
Tar compress bz2 manual#
From the manual page bzip2(1): bzip2 will read arguments from the environment variables BZIP2 and BZIP, It is also possible to set bzip2 options through the environment variable BZIP2. tar with tar -> bzip it with bzip2 -> write it to. My favorite way, the UNlX way, is one where you use every tool independently, and combine them through pipes. You can set bzip2 block size when using tar in a couple of ways. And -best merely selects the defaultĪs you want faster compression with less regards to compression ratio, using bzip2, you seem to want the -1 (or -fast) option. The -fast and -best aliases are primarily for GNU gzipĬompatibility. From the manual page bzip2(1): -1 (or -fast) to -9 (or -best)
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