Shulou(Shulou.com)06/03 Report--

Tar command

Function: package and compress files

[root@localhosttest] # tar-- help

Usage: tar [OPTION...] [FILE]...

GNU `tar' saves manyfiles together into a single tape or disk archive, and can

Restore individualfiles from the archive.

Examples:

Tar-cf archive.tar foo bar # Create archive.tar from files foo and bar.

Tar-tvf archive.tar # List all files in archive.tarverbosely.

Tar-xf archive.tar # Extract all files from archive.tar.

Package:

[root@localhost ~] # tarcvf grub2.tar / boot/grub2/

# c create creation

# v details

# f filename

[root@localhost ~] # file a.txt

A.txt: POSIX tararchive (GNU)

[root@localhost ~] # file / etc/passwd

/ etc/passwd: ASCII text

File command

Function: file determines filetype

Usage: file / etc/passwd

Note: the linux system does not recognize file types based on suffix names

Use the file command to see the type of file.

Example: package two directories or target + files into a software package

[root@localhost ~] # tarcvf ss.tar / boot/ / etc/passwd

Instead of unpacking, check the contents of the tar:

Example:

[root@localhost ~] # tartvf ss.tar

Unpack:

[root@localhost ~] # tarxvf grub2.tar

Specify the decompression path:

[root@localhost] # tarxvf grub2.tar-C / opt/

Compare file size

[root@localhost ~] # du-sh / boot/grub2/

8.1M / boot/grub2/

[root@localhost ~] # ll-h grub2.tar

-rw-r--r-- 1 root root7.7M Dec 3 20:41 grub2.tar

Tar Archive + Compression:

Format (suffix): .tar.gz or .tgz

Syntax: tarzcvf newfile.tar.gz SOURCE

[root@localhost ~] # tarzcvf grub2.tar.gz / boot/grub2/

Compare the size

[root@localhost ~] # ll-h grub2.tar*

-rw-r--r-- 1 root root7.7M Dec 3 20:41 grub2.tar

-rw-r--r-- 1 root root3.1M Dec 3 21:02 grub2.tar.gz

Decompress:

[root@localhost] # tarzxvf grub2.tar.gz-C / opt/

Archiving + compression: bz2

Compression:

[root@localhost ~] # tarjcvf grub2.tar.bz2 / boot/grub2/

Format (suffix): .tar.bz2

Syntax: tar jcvf newfile.tar.bz2 SOURCE

Compare the size

[root@localhost ~] # ll-h grub2.tar*

-rw-r--r-- 1 root root7.7M Dec 3 20:41 grub2.tar

-rw-r--r-- 1 root root2.5M Dec 3 21:08 grub2.tar.bz2

-rw-r--r-- 1 root root3.1M Dec 3 21:02 grub2.tar.gz

Decompress: # tar-jxvfnewfile.tar.gz-C / PATH/TO/DISTDIR/

[root@localhost] # tarjxvf grub2.tar.bz2-C / opt/

Zip package decompression command:

Zip is the compression program and unzip is the decompression program.

Compress the file:

[root@localhost ~] # zippasswd.zip / etc/passwd

-r compressed directory

[root@localhost ~] # zip-r grub2.zip / boot/grub2/

Task: can the Linux system decompress the rar format? If possible, how to decompress it?

Decompression

[root@localhost] # unzip grub2.zip-d / opt/

Add:

Compression command: gzip bzip2 xz

Syntax format:

Gzip file

Bzip2 file

Xz file

Decompress:

Gzip-d file

Bzip2-d file

Xz-d file or unxz file

Use zcat, bzcat and xzcat to view the content without decompression.

Features: the file can only be compressed, and the source file disappears after compression (in which the xz command can add the-k parameter to retain the source file)

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