Linux Compression Packaging Introduction, gzip compression tool, bzip2 compression tool, XZ compression tool

Note content:

L 6.1 Compression Packaging Introduction

L 6.2 gzip compression tool

L 6.3 bzip2 compression tool

L 6.4 xz compression tool

Note Date:2017.8.5

6.1 Compression Packaging Introduction

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It is well known that file compression takes up a small amount of disk space, and because the size of the file is smaller after compression, it is faster to transfer over the network and reduces the use of network bandwidth resources.

The network in the server room is different from the home, the network of the general server is the upper and lower line. The home network only downloads fast, the upload speed is slow, therefore the server room network bandwidth is more expensive, the compressed file is one of the methods of saving the bandwidth resources.

in the Linux file suffix can be arbitrarily customized, but it is best to follow the regular format to define the file suffix, which facilitates the convenience of distinguishing and identifying files.

6.2 gzip compression tool

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For example I use gzip to compress a 1.txt file:

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Unzip 1.txt File:

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Since this file has some virtual space before compression, the file size after compression is different, just like a sponge.

Gzip can specify the level of compression, there are altogether 1-9 levels, the default is 6 levels,1 levels is the least rigorous compression, So the compressed file is larger, but consumes less CPU resources. 9 is the most rigorous compression, but consumes more CPU Resources, in general, the compression level is the default.

Specify the compression level example:

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The Gunzip command can also unzip the file:

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use the file command to view information about a compressed file:

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use the zcat command to view the contents of a zip file in gz format, which is actually extracted and then viewed:

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from the above experiment can know that using gzip compressed file after the original file will disappear to become a compressed file, but the gzip - c option allows the original file does not disappear, Regenerate a compressed file, and you can also specify a storage path for the compressed file:

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The relative decompression can also do this:

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Note:gzip cannot compress the catalog

6.3 bzip2 compression tool

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This bzip tool is more compressed than gzip , which means more CPU resources, and the two tools have different compression algorithms.

Minimal installation may not have this tool and need to be installed with the yum install-y bzip2 command:

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The usage of bzip2 and gzip is almost identical:650) this.width=650; "Src=" Https://s4.51cto.com/wyfs02 /m01/08/65/wkiom1ngmooiecgdaalkiebe4as133.png "style=" Float:none; "title=" Linux Compression packaging Introduction, gzip compression tool, bzip2 compression tool, XZ compression tool 875.png "alt=" Wkiom1ngmooiecgdaalkiebe4as133.png "/>

Unzip the same can use two commands:

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You can specify a storage path for the compressed file by adding the-C option:

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The relative decompression can also do this:

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Bzip2 also has a compression level, you can specify the level of compression, and also the compression level of 1-9, the default compression level is 9, so you generally do not need to specify the compression level.

Example:

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You can use file to view the information for a compressed file:

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The Bzcat command can view the contents of a compressed file in the bz2 format, the same principle as the gzip zcat command:

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6.4 xz compression tool

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The XZ compression tool is similar to the previous two compression tools, but it is not often used, but in a common tar package, a compressed package with a suffix of tar.xz is often seen . So this tool is also to be understood.

Compression Example:

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from the compression results can be seen, this xz tool on the file compression than the first two tools more ruthless, directly compressed to dozens of K , the corresponding more CPU -intensive resources.

the same xz tool also has a compression level, you can specify the level of compression, is also the compression level of the 1-9, the default compression level is 6 .

Unzip Example:

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You can specify a storage path for the compressed file by adding the-C option:

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Decompression can also do this:

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Xzcat command to view the contents of a compressed file:

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You can use file to view the information for a compressed file:

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Linux Compression Packaging Introduction, gzip compression tool, bzip2 compression tool, XZ compression tool