linux--and the original--tar command

Compression and decompression

Tar command

The tar command can be used to create files and archives for Linux.

With tar, you can create files for a specific file (a file), change files in a file, or add new files to the file. Tar was originally used to create files on a magnetic tape, and now, you can create files on any of your facilities.

With the tar command, you can package a whole bunch of files and records into a single file, which is very useful for preparing files or combining several files into a file for network transport.

The first thing to understand is two concepts: packaging and compression.

Packaging refers to a large number of files or records into a large file; The compression method transforms a large file through some compression algorithms into a small file.

Why do you want to divide these two concepts? This is because many of the compression programs in Linux can only compress a single file, so when you want to compress a lot of files, you have to first make a bundle of these files (the tar command) and then use the compression program to compress (gzip bzip2 commands).

Language structures

Tar (option) (The new file needs to be packaged)

Option

1 2 3 4 5 6 7 8 9-All of the following: Add a file to the existing file;-B: Set the size of the block;-C or--create: Create a new copy of the file -c<;: This option is used for decompression, which is the option to use in order to decompress in a specific recording. -D: The difference between the records;-X or--extract or--get: The original file from the prepared document;-T or--list: Lists the contents of the file,-Z or--gzip, or--ungzip: through the gzip command to process the files; Z or--compress or--uncompress: Through the Compress instructions for the preparation of documents,-f< prepare documents > or--file=< files;: Specify the files;-V or--verbose: Show instructions to perform the process; R: Add files to an already compressed file;-U: Add changes and existing files to existing compression files;-j: supports bzip2 files;-V: Shows the operation process;-L: File system border setting;-K: Retain the original file without overwriting;-W: Keep the file not covered; The accuracy of the file,-P or--same-permissions: The original file is the same as the original file;-P or--absolute-names: The filename uses the absolute name, does not remove the "/" symbol before the filename,-n< date format > or--newer= < date;: Save only files that are updated on the specified date to the file;--exclude=< template;: Exclude files that conform to the template.

Parameters

File or Catalog: Specify the file or list to be packaged

Example: Spare parts

Package all files into a tar package

1 2 3 TAR-CVF Log.tar Log2017.log #僅打包, non-compression. TAR-ZCVF log.tar.gz log2017.log #打包後, gzip tar-jcvf log.tar.bz2 log2017.log #打包後 to bzip2 compression

The file name after the option F is taken, and we are used to it. Tar. If you add the z option, the. tar.gz or. tgz represent the gzip-compressed tar package, and if you add J, the. tar.bz2 is used as the TAR package name.

Check out those files in the tar package.

1 2 3 TAR-TVF Log.tar #查看tar包內的文件, two types of compression packs can be viewed. TAR-ZTVF log.tar.gz #查看tar包內的文件, in gzip-compressed format package. TAR-JTVF log.tar.bz2 #查看tar包內的文件, packages in bzip2 compression format.

File, and save its rights:

1 TAR-ZCVPF log31.tar.gz Log2014.log log2015.log log2016.log More professional Related: http://www.unixlinux.online/unixlinux/ Linuxjcgylinux/201704/103965.html

linux--and the original--tar command