Introduction to Linux compression and decompression commands

Command---> Suffix---> Decompression command gzip ---> .gz ---> gunzip

bzip2 ---> .bz2 ---> bunzip2

xz ---> .xz --->unxz 

zip ---> .zip --->unzip

tar ----> .tar --->tar -xvf expand archive

tar combined archive compression and decompression gzip---> -czvf ---> -xzvf

bzip2---> -cjvf ---> -xjvf 

xz---> -cJvf ---> -xJvf

The CPU time consumed by compression and decompression and the compression ratio vary greatly between different methods.

From the perspective of compression ratio: tar < gzip < bzip2 < xz < zip

Function: compress files Usage: gzip file (compressed file, can only compress files into *.gz files)

Note: gzip follows the file to be compressed, the original file is deleted by default -d decompression -9 sets the compression level to 6 by default

Commonly used: zcat compressed file // No need to decompress directly to view decompression: gunzip log.gz // decompression

Function: decompress the file Usage: gunzip file.gz (decompress file command)

Stronger compression than gzip above. Higher compression ratio. -d decompression -9 Set the compression level to 9. The default is 6.

bzcat log.bz2 | more # View the contents of the compressed text file without decompression bunzip2 log.bz2 # Decompression

bunzip2 log.bz2 #decompression

xz file to be compressed -d decompress -9 set compression level

unxz decompress xzcat view the contents of a compressed text file without decompression

unxz decompression

Function: compress folders, files and directories Command usage: zip [option] log.zip log #log.zip compressed file name log is the file to be compressed -r: recursive compression Note:

zip The file name after the search is kept by default.

1. Compress all files under /home into myhome.zip

        zip -r myhome.zip /home/ [compress the home directory and its contained files and subfolders]

2. Unzip myhome.zip to the /opt/tmp directory unzip -d /opt/tpm myhome.zip

unzip log.zip #Unzip

Function: decompress the folder Usage: unzip [option] xxx.zip

Common options -d <directory>: specify the directory where the compressed files are stored

Function: tar command is an archiving/packaging command, and the final packaged file is a .tar.gz file. Usage: tar [option] xxx.tar.gz packaged content (packaging directory, compressed file format .tar.gz)

-c: Generate .tar file -v: Display detailed information -f: Specify compressed file name -z: Pack and compress at the same time -x: Unpack .tar file

-x : unpack .tar file

tar -cvf benwei.tar img ---> benwei.tar (archived file)   

The file f to be archived must be in front of the archived file name. 1. Compress multiple files and compress .home/pig.txt and /home/cat.txt into pc.tar.gz

        tar -zcvf pc.tar.gz /home/pig.txt /home/cat.txt

2. Compress the /home folder into myhome.tar.gz

        tar -zcvf muhome.tar.gz /home

3. Unzip pc.tar.gz to the current directory tar -zxvf pc.tar.gz

4. Unzip myhome.tar.gz to the /opt/tmp2 directory tar -zxvf /home/myhome.tar.gz -C /opt/tmp2

tar -tf cc.tar # View the files in the archive without expanding it tar -xvf cc.tar # Expand the archive

tar -czvf myimg.tar.gz img

#Archive and call gzip compression. After completion, myimg.tar.gz contains myimg.tar, and then the original folder. Unzip: tar -xzvf myimg.tar.gz #Unzip directly to decompress the img folder

tar -cjvf #Package and call bzip2 to compress tar -xjvf #Decompress

tar -cJvf #Package and call xz to compress tar -xJvf #Decompress