Shulou(Shulou.com)06/03 Report--

I. Introduction to packaging tools

Using compressed files saves not only disk space, but also time and network bandwidth

Windows common zip file: rar zip 7z

Linux common compressed files: zip .gz. bz2.xz, .tar,.xz, tar.gz tar.bz2

Second, gzip compression tool

gzip format: gzip(-d -c)# filename , where #is 1-9 numbers, corresponding to 1-9 levels respectively

gzip compression levels 1-9, default 6

-d This parameter is used when decompressing

-c Output compressed files to the specified directory without changing the original files

gzip cannot compress directories

Create a directory named d 6z, use the find command to find files ending in conf: find /etc/ -type f -name "conf" , and then output the file to a file 1.txt

find /etc/ -type f -name "conf" -exec cat {} >>1.txt \;

Repeat appending and checking file size, then compress file

After decompression is completed, if you want to view the contents of the decompressed file, you cannot use cat, you can use zcat, decompress first and then view.

At the same time, when compressing files, you can also specify directories: and the original files will not disappear.

Extract the file and specify the path:

gunzip -c /tmp/1.txt.gz > /tmp/d6z/2.txt

Third, bzip2 compression tool

bzip2 command format is bzip2 (-d) filename -d decompression compression level is also 1-9 levels, default is 9

bzip2 usage is basically the same as gzip, but also can not compress the directory, compression is more severe than gzip, CPU resources are also more expensive

bzip2 command is not installed by default. yum insatll -y bzip2 needs to be installed

View files by bzcat

bzip2 can also specify directories and decompression paths

IV. XZ Compression Tool

xz command format is xz (-d)filename, usage and gzip, bizp2 similar, compression degree is the most severe, also does not support compressed directory

Two decompression methods: xz -d unxz

You can also keep the original file and compress it to a specified directory, or you can specify the path of decompression while saving the original file.

You can use file to view file types

V. Zip compression tool

zip package is commonly used in Windows and Linux, you can compress files and directories, and after compression, the original files will not be deleted

Installation command: yum install -y zip

Usage: zip 1.txt.zip 1.txt zip+ file name of compressed package + source file to be compressed (source file will not be deleted)

-r option can compress multiple files or directories, compressed directory needs to add-r option

To extract files or directories you need to install unzip: yum install -y unzip

When extracting files, since zip compression will not delete the original files, if you do not delete them manually, you will be prompted whether to overwrite or replace them when decompressing. A represents all

Zip to the specified directory:

zip decompression file can not specify the file name, what is the name before decompression or after decompression

VI. tar packing

tar can package directories into one file, consolidate all files or directories into one file, and facilitate copying and moving.

Command format: tar+ options +filename

-c: Create a tar or compressed file package

-v: visualization

-f: Specify the destination file name, use multiple parameters in combination, -f at the end

-t: View the files inside the package

-exclude filename: filter the contents of the file

tar package directory, if the file has been packaged, packaging again will overwrite the file, there will be no prompt

tar supports file directories mixed packaging

tar unpacking

tar View package file list-tf

tar filters specified files

VII. Packaging and compression

You can also use gzip compression at the same time as packaging, plus the-z option; unpacking is to replace the command-c with-x.

Packaging can also use bzip compression, plus-j option; unpacking is to replace the command-c with-x

Packaging can also be used xz compression, plus-J option; unpacking is to replace the command-c with-x

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