Compression and decompression

zip/unzip

zip Command can be used to extract files , Or package the file 
unzip The command is used to decompress the zip Command compressed “.zip” Compressed package 
 These two are not Linux Self contained , Need to install 
sudo apt-get install zip
sudo apt-get install unzip
zip:
-q： Do not show instruction execution 
-r： Recursive processing , Process all files and subdirectories in the specified directory 
unzip:
-o   Don't ask again during decompression , Directly covered 
-d   Unzip the file to the specified folder 
zip -q -r ~/test.zip test	#  Specify path compression 
unzip test.zip -d ~/tmp/a	#  Specify the path to unzip 

gzip/gunzip

gzip Command to compress files .gzip Is a widely used compression program , After it compresses the file , There will be many places after its name .gz Extension .
gunzip The command is used to extract files .gunzip Is a widely used decompression program , It's used to unravel gzip Compressed files , These compressed files have a default last extension of .gz. in fact gunzip Namely gzip The hard connection of , So whether it's compression or decompression , All available gzip Complete the instruction alone 

gzip:
-d  Decompress the compressed file 
-r  Recursively compress all files in the specified directory and subdirectories 
-l  Display the compression information of the compressed file 
-c  Reserved source file 
gunzip：
-c  Output the extracted file to the standard output device 
-f  Force unpack compressed file 
-q  Do not display warning messages 
-r  Recursive processing 
-v  Show command execution 
gzip a.py
gzip -c b.py > b.py.gz	#  Reserved source file 
gzip -d a.py.gz	#  decompression 

bzip2/bunzip2

bzip2 Commands are used to create and manage （ Includes decompression ）.bz2 Compressed package of format , It is Linux The next compression software , Than traditional gzip or zip The compression efficiency of , But its compression speed is slow .
bunzip2 Command decompression by bzip2 Created by instruction .bz2 Compressed package 
-c   Send the compression and decompression results to standard output 
-d   Perform decompression 
-f   When the file has the same name , Presets do not overwrite existing files , Using this will overwrite 
-k  bizp2  After compression or decompression , Will delete the original file , Using this will not delete 
-s   Reduce memory usage during program execution 
-v   When compressing or decompressing a file , Displays detailed information 
bzip2 a.py
bzip2 -c b.py > b.py.bz2 #  Reserved source file 
bzip2 -d a.py.bz2	#  decompression 

collect files

tar The command is used to pack or unpack files , The extension is usually .tar, Specify specific parameters to call gzip or bzip2 Make or unpack the package 
-c  Create a new package 
-x  Decompress the package 
-f  Use the name of the compressed package ,f Parameters cannot be added after them 
-i  Ignore... In the archive 0 Word block 
-v  Output relevant information during processing 
-z  call gzip To compress the archive , And -x Call gzip Complete decompression 
-j  call bzip2 Compress or decompress 
-p  Use the original properties of the source file 
find -name '*.py' >> ~/a.list
tar -T a.list -zcvf a.tar.gz
tar -zcvf a.tar.gz a.list

Link command

ln The command is used to create links for files , Link types are divided into hard link and symbolic link , The default link type is hard link . If you want to create symbolic links, you must use -s Options 

 Be careful ： The symbolic link file is not a separate file , Many of its properties depend on the source file , So it doesn't make sense to set access permissions for symbolic link files 

 Soft link will only generate a linked file of a file at the destination , It doesn't actually take up disk space , amount to Windows Shortcuts in . The hard link will generate a file with the same size as the source file at the destination . Both soft links and hard links , Files keep changing synchronously .
-i  Ask users before overwriting existing files 
-s  Create symbols ( soft ) Links instead of hard links 
 If you modify the contents of the file , Then the links will change with each other 
 If you delete the source file , Hard links can continue to be used , Soft link failure