Linux Learning Notes (packaged compression tool)

The backup of data is a key thing in the operation and maintenance process. There is no price for data.

Content:

1. Several compression tools

   Compress Uncompress	Old compression appliances are generally not available now.
   gzip:. GZ Gunzip Zcat Look at the text content without pressure. Note: The source files	gzip-d file decompression files are deleted after compression gzip-# File Set decompression ratio-1-9 default is -6 gzip–c filename  >/path/to/filename.gz can save the source file gunzip-c filename > /path/to/filename.g
   Bzip2:.bz (default delete source file) Bunzip2 Bzcat	Compression tool with a greater compression ratio than gzip -D: Unzip -#: Setting the compression ratio -K: Keep the original file when compressing
   XZ:. XZ (the default is to delete source files) Unxz Xzdec Xzcat	Xz/path/to/somefile -D: Unzip -#: Specify compression ratio -K: Keep the original file when compressing
   Zip: A tool that can be archived and compressed	Usage: Zip filename.zip FILE1 FILE2 ...: The original file is not deleted after compression Unzip Filename.zip
   tar is a very powerful command: instance: 1. Package compression: TAR-CVF package.tar/mnt package only TAR-ZCVF PACKAGE.TAR.GZ/MNT packaged and compressed with gzip TAR-JCVF package.tar.bz2/mnt packaged and bzip2 compressed 2. View: TAR-TVF Package.tar Tar- TZVF package.tar.gz TAR-TJVF package.tar.bz2 3. Unpack the package: TAR-XZVF package.tar.gz Unpack the package to your directory. TAR-XJVF package.tar.bz2 Ibid. 4. Unlock a single file. TAR-XZVF package.tar.gz filename 5. Back up the files and save the permissions. Tar-czv	-C Create a parameter directive (create) for a compressed file -X Unpack the parameter instructions for a compressed file -T view the files inside the tarfile. Special Note: The above parameters can only have one existence at a time. -F Use the file name. Note: This is directly followed by the file name, otherwise there will be an error. -V: Files are displayed during compression! -Z: Using gzip compression -J: Using bzip2 compression -P: Use original attribute of original file -P: You can use absolute path to compress! -N: Newer than the date next to it will be packaged into a new file! --exclude file: Do not package file in the process of compression!
   Cpio For detailed usage, you can refer to bird's private cuisine.	Principle: File input and output via data stream redirection

   Summary: The above gzip, bzip2, and XZ are all compression tools. The ability to achieve compression and archive (archive) is zip and tar as well as cpio. Commonly used is tar.

3. DD command

5. DD Command: Instance: 1. Back up the/etc/passwd to the/tmp/passwd.back DD If=/etc/passwd/of=/tmp/passwd.back 2. Backing up the/DEV/SDA MBR DD IF=/DEV/SDA of=/tmp/mbr.back bs=512 count=1 3. Back up the entire partition/dev/sda1 DD if=/dev/sda1 Of=/some/path/filename

   Parameters: If: is the input file can also be a device Of: The output file can also be a device BS: Plan the size of a block, if not set is the post preset on 512bytes Count: How many BS means.

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Linux Learning Notes (packaged compression tool)