Linux in the gzip command to use the detailed

Gzip

A compression command that is more commonly used under Linux to compress a file into a compressed file with a. GZ ending

Preparatory work

[Root@localhost etc]# Cp/etc/man.config/tmp

[Root@localhost etc]# Cd/tmp

[Root@localhost tmp]# LL

Total 12

-rw-r--r--. 1 root root 2730 June 03:45 Chkconfig.txt

-rw-r--r--. 1 root root 4940 Aug 12:37 man.config

1. Compress man.config Files

[Root@localhost tmp]# gzip Man.config

[Root@localhost tmp]# LL

Total 8

-rw-r--r--. 1 root root 2730 June 03:45 Chkconfig.txt

-rw-r--r--. 1 root root 2184 Aug 12:37 man.config.gz

You can see the source file Man.config is not replaced by a compressed file that ends with. gz. Compared to the source file, you can find that the size does have a narrowing

2. Decompression man.config.gz

[Root@localhost tmp]# gzip-d man.config.gz

[Root@localhost tmp]# LL

Total 12

-rw-r--r--. 1 root root 2730 June 03:45 Chkconfig.txt

-rw-r--r--. 1 root root 4940 Aug 12:37 man.config

3. If you want to keep the source files, you can use the following command

[Root@localhost tmp]# gzip-c man.config >>man.config.gz

[Root@localhost tmp]# LL

Total 16

-rw-r--r--. 1 root root 2730 June 03:45 Chkconfig.txt

-rw-r--r--. 1 root root 4940 Aug 12:37 man.config

-rw-r--r--. 1 root root 2184 Aug 13:02 man.config.gz

4. Test the compressed file is wrong

[Root@localhost tmp]# Gzip-tv man.config.gz

Man.config.gz:OK

which

-T parameter check if the compressed file is wrong

The-v parameter displays more detailed information, is used in the compression process, and can display the compression ratio and so on.

[Root@localhost tmp]# gzip-v Man.config

man.config:56.4%--Replaced with man.config.gz

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/OS/Linux/

5.gzip has 9 compression levels where-9 compression is the best-1 compression speed the fastest default compression level is-6

[Root@localhost tmp]# Gzip-cv-1 man.config >>man.config1.gz

man.config:53.4%

[Root@localhost tmp]# gzip-cv-9 man.config >>man.config9.gz

man.config:56.4%

[Root@localhost tmp]# LL

Total 20

-rw-r--r--. 1 root root 2730 June 03:45 Chkconfig.txt

-rw-r--r--. 1 root root 4940 Aug 12:37 man.config

-rw-r--r--. 1 root root 2332 Aug 13:14 man.config1.gz

-rw-r--r--. 1 root root 2184 Aug 13:15 man.config9.gz

As you can see, different compression ratios do make a difference.

Let's go over Linux. Another commonly used compression command bzip2 it uses the same method as gzip, but it generates a file suffix named. bz2 we actually do it.

[Root@localhost tmp]# bzip2-zkv Man.config

Man.config:2.251:1, 3.555 Bits/byte, 55.57% saved, 4940 in, 2195 out.

[Root@localhost tmp]# LL

Total 24

-rw-r--r--. 1 root root 2730 June 03:45 Chkconfig.txt

-rw-r--r--. 1 root root 4940 Aug 12:37 man.config

-rw-r--r--. 1 root root 2332 Aug 13:14 man.config1.gz

-rw-r--r--. 1 root root 2184 Aug 13:15 man.config9.gz

-rw-r--r--. 1 root root 2195 Aug 12:37 man.config.bz2

Where you need to add-Z Parameters for compression

-K can keep source files

From the compression result, BZIP2 has a better compression effect.