Linux file packaging, compression detailed

Under the Linux platform, there are several common compression tools:

=========================================================================
工 具 文件扩展名 描述
-------------------------------------------------------------------------
bzip2 .bz2 采用Burrows-Wheeler块排序文本压缩算法和霍夫曼编码
compress .Z 原始的Unix文件压缩工具，逐渐消失中
gzip .gz GNU压缩工具，用Lempel-Ziv编码
zip .zip Windows上PKZIP工具的Unix实现
=========================================================================


1.bzip2
1) bzip2: Used to compress files
2) Bzcat: Used to display compressed text file contents
3) BUNZIP2: Used to decompress. bz2 files
4) Bzip2recover: Used to try to recover corrupted compressed files
Usage:

$ bzip2 file

By default, the BZIP2 command attempts to compress the original file and replace it with the compressed file (the same file name plus the. bz2 extension).
Extract:

$ bunzip2 file.bz2

If file is a text document, you can view it with Bzcat:

$ bzcat file.bz2


2.gzip
1) gzip: Compress files
2) Gzcat: View Compressed text file
3) Gunzip: Unzip the file
Usage is the same as bzip2.

3.tar
Command format for tar:

tar function [options] object1 object2


The

Function parameter defines what the tar command should do, such as the following table:

===================================================== =======================
Description of the full name of the feature
----------------------------------------------------------------------- -----
-A--concatenate to append an existing tar archive file to another existing tar archive
-C--create Create a new tar archive file
-d--diff Check the differences between the archive and the file system
--delete Remove the
-r--append append file from the existing tar archive file to the end of the existing tar archive
-T--list lists the contents of the existing tar archive
-u--update Append a new file with the same name as the one already in the TAR archive file to the TAR archive
-X--extract Extract the file from the existing tar archive
=========================================== =================================


Each feature is available with options to define a specific behavior for the TAR archive file. The following table lists the most common options that can be used with the tar command in these options.

==================================================================
选 项 描 述
------------------------------------------------------------------
-C dir 切换到指定目录
-f file 输出结果到文件或设备file
-j 将输出重定向给bzip2命令来压缩
-p 保留所有文件权限
-v 在处理文件时显示文件
-z 将输出重定向给gzip命令来压缩
==================================================================


Typically, these options are used together.
For example, you can create an archive file with the following command:

tar -cvf test.tar test/ test2/

The above command creates a Test.tar archive containing the contents of the test and test2 directories.
Then, with this command,

tar -tf test.tar

Lists the contents of the tar file Test.tar, but does not unzip it.
Finally, use the following command

tar -xvf test.tar

Extract content from Test.tar.