Linux compressed command tar

 

Root @ Linux ~] #Tar [-cxtzjvfppn] file and directory ....
Parameters:
-C: Create a parameter command for the compressed file );
-X: Unlock the parameter command of a compressed file!
-T: view the files in the tarfile!
Note that C/X/T can only exist under the parameter! Cannot exist at the same time!
Because it is impossible to simultaneously compress and decompress.
-Z: does it have the gzip attribute at the same time? That is, do I need to use gzip for compression?
-J: Does it have Bzip2 attributes at the same time? That is, do I need to use Bzip2 for compression?
-V: The file is displayed during compression! This is common, but it is not recommended to use it in the background execution process!
-F: use the file name. Please note that the file name should be followed immediately after F! Do not add parameters!
For example, using "Tar-zcvfp tfile sfile" is an incorrect method.
"Tar-zcvpf tfile sfile" is correct!
-P: use the original attributes of the original file (the attributes will not be changed based on the user)
-P: absolute paths can be used for compression!
-N: a new date (yyyy/mm/DD) will be packed into the new file!
-- Exclude file: do not pack the file during compression!
Example:
Example 1: package all the files in the/etc directory into/tmp/etc.tar
[Root @ Linux ~] #Tar-CVF/tmp/etc.tar/etc<= Package only, not compressed!
[Root @ Linux ~] #Tar-zcvf/tmp/etc.tar.gz/etc<= Compressed with gzip After packaging
[Root @ Linux ~] #Tar-jcvf/tmp/etc.tar.bz2/etc<= Compressed with Bzip2 After packaging
# Note that the file name after parameter F is obtained by ourselves. We use. tar for identification.
# If the Z parameter is added, .tar.gz or. tgz is used to represent the tar file ~ compressed by gzip ~
# If you add the J parameter, use .tar.bz2 as the file name ~
# A warning message is displayed when the preceding command is executed:
# "Tar: removing leading '/' from Member names" is a special setting for absolute paths.

Example 2: Check the files in the above/tmp/etc.tar.gz file?
[Root @ Linux ~] #Tar-ztvf/tmp/etc.tar.gz
# When we use gzip to compress the files in the TAR file,
# Add the Z parameter! This is important!

Example 3: Decompress the/tmp/etc.tar.gz file under/usr/local/src.
[Root @ Linux ~] #CD/usr/local/src
[Root @ Linux SRC] #Tar-zxvf/tmp/etc.tar.gz
# By default, We Can uncompress files anywhere! In this example,
# First, I will transform the working directory to the/usr/local/src directory, and unlock/tmp/etc.tar.gz,
# The unlocked directory will be in/usr/local/src/etc! In addition, if you enter/usr/local/src/etc
# The file attributes in this directory may be different from those in/etc!

Example 4: Under/tmp, I only want to unbind the etc/passwd in/tmp/etc.tar.gz.
[Root @ Linux ~] #CD/tmp
[Root @ Linux TMP] #Tar-zxvf/tmp/etc.tar.gz etc/passwd
# I can use tar-ztvf to check the file name in the tarfile. If you only need one file,
# You can issue it in this way! Notice! The root directory in etc.tar.gz/is removed!

Example 5: Back up all the files in/etc/and save their permissions!
[Root @ Linux ~] #Tar-zxvpf/tmp/etc.tar.gz/etc
# This-P attribute is very important, especially when you want to keep the attributes of the original file!

Example 6: only new files in/home are backed up.
[Root @ Linux ~] #Tar-N '2014/1/01'-zcvf home.tar.gz/home

Example 7: I want to back up/home,/etc, but not/home/dmtsai
[Root @ Linux ~] #Tar -- exclude/home/dmtsai-zcvf myfile.tar.gz/home/*/etc

Example 8: package/etc/and unpack it under/tmp without generating a file!
[Root @ Linux ~] #CD/tmp
[Root @ Linux TMP] #Tar-CVF-/etc | tar-xvf-
# This action is a bit like CP-r/etc/tmp ~ It is still useful!
# Note that the output file is changed to-and the input file is changed to-, and there is another file | Yes ~
# This represents standard output, standard input, and pipeline commands respectively!
# This part will be explained again when we mention this command in bash shell!

Gzip and zcat commands

[Root @ Linux ~] # Gzip [-CDT #] File Name [Root @ Linux ~] # Zcat file name .gz Parameters: -C: outputs compressed data to the screen and can be processed through data stream redirection; -D: extract parameters; -T: it can be used to check the consistency of a compressed file ~ Check whether the file has any errors; -#: Compression level.-1 is the fastest, but the compression ratio is the worst.-9 is the slowest, but the compression ratio is the best! Default Value:-6 ~ Example: Example 1: Convert/etc/man. config to/tmp and compress it with Gzip [Root @ Linux ~] # Cd/tmp [Root @ Linux TMP] # cp/etc/man. config. [Root @ Linux TMP] # gzip man. config # At this time, man. config will become man.config.gz! Example 2: Read the content of Example 1! [Root @ Linux TMP] # zcat man.config.gz # The man.config.gz extracted file content is displayed on the screen !! Example 3: Decompress the file in Example 1 [Root @ Linux TMP] # gzip-D man.config.gz Example 4: compress man. config unlocked in Example 3 with the optimal compression ratio and keep the original file [Root @ Linux TMP] # gzip-9-C man. config> man.config.gz

Bzip2, bzcat command

[Root @ Linux ~] # Bzip2 [-CDZ] File Name [Root @ Linux ~] # Bzcat file name .bz2 Parameters: -C: output the data generated during the compression process to the screen! -D: extracted Parameters -Z: Compression Parameters -#: Same as gzip, it is used to calculate the compression ratio.-9 is the best, and-1 is the fastest! Example: Example 1: compress/tmp/man. config with Bzip2 [Root @ Linux TMP] # Bzip2-Z Man. config # At this time, man. config will become man.config.bz2! Example 2: Read the content of Example 1! [Root @ Linux TMP] # bzcat man.config.bz2 # The man.config.bz2 extracted file content is displayed on the screen !! Example 3: Decompress the file in Example 1 [Root @ Linux TMP] # Bzip2-D man.config.bz2 Example 4: compress man. config unlocked in Example 3 with the optimal compression ratio and keep the original file [Root @ Linux TMP] # Bzip2-9-C man. config> man.config.bz2

Compress command

[Root @ Linux ~] # Compress [-DCR] file or directory Parameters: -D: extract parameters. -R: It can be compressed together with files in the directory! -C: Output compressed data to standard output (output to the screen) Example: Example 1: Convert/etc/man. config to/tmp and compress it [Root @ Linux ~] # Cd/tmp [Root @ Linux TMP] # cp/etc/man. config. [Root @ Linux TMP] # compress man. config [Root @ Linux TMP] # ls-l -RW-r -- 1 Root 2605 Jul 27 :43 man. config. Z Example 2: Unlock the compressed file [Root @ Linux TMP] # compress-d man. config. Z Example 3: compress man. config into another file for backup [Root @ Linux TMP] # compress-C man. config> man. config. Back. Z [Root @ Linux TMP] # ll man. config * -RW-r -- 1 Root 4506 Jul 27 :43 man. config -RW-r -- 1 Root 2605 Jul 27 :46 man. config. Back. Z # This-C parameter is interesting! He will output the data from the compression process to the screen, instead of writing the data # File. Z file. Therefore, we can output data to another file name through data stream redirection. # Concerning data stream redirection, we will discuss it in detail in bash shell!