Linux File compression and Archiving

Linux File compression and Archiving

Linux File compression and Archiving

File compression

Common compression Commands include gzip and bzip2.

Gzip Command Format

Gzip [-acdfhlLnNrtvV19] [-S suffix] [name...]

Command Parameters

-C -- stdout -- to-stdout
Write the output content to the standard output port and keep the original file unchanged.

-D -- decompress -- uncompress
Extract

-F -- force
Force Compression

-H -- help
Print help information

-L -- list
List compressed file compression statistics

-L -- license
Print version and copyright information

-Q -- quiet
Do not display warning information

-R -- recursive
Recursive Compression

-S. suf -- suffix. suf
The suffix of the compressed file is. suf, and the default suffix is. gz.

-T -- test
Integrity check of compressed files

-V -- verbose
Detailed information is displayed during compression.

-V -- version
Print version and copyright information

-# -- Fast -- best
Set the compression level. # The value range is 1 ~ 9, # The larger the value, the slower the compression speed, the better the compression effect. The default value is 6.

Instance

A) compressed file

bkjia@bkjia:~/bkjia/linux/cmdline$ gzip foo

B) decompress the file

bkjia@bkjia:~/bkjia/linux/cmdline$ gzip -d foo.gz

bkjia@bkjia:~/bkjia/linux/cmdline$ gunzip foo.gz

C) List compressed file compression statistics

bkjia@bkjia:~/bkjia/linux/cmdline$ gzip -l foo.gz          compressed        uncompressed  ratio uncompressed_name               4150               26134  84.2% foo

D) specify the compression level

bkjia@bkjia:~/bkjia/linux/cmdline$ gzip -v9 foofoo: 84.9% -- replaced with foo.gz

E) only view the content of the compressed file.

bkjia@bkjia:~/bkjia/linux/cmdline$ date > foobkjia@bkjia:~/bkjia/linux/cmdline$ gzip foobkjia@bkjia:~/bkjia/linux/cmdline$ gzip -dc foo.gz Thu May  7 17:10:35 CST 2015

Related commands

Gunzip-extract, equivalent to gzip-d

Zless-view the compressed file content. zless test.gz is equivalent to gunzip-c test.gz | less

Zcat-similar to zless, zcat test.gz is equivalent to gunzip-c test.gz | cat

Bzip2 command

Bzip2 is similar to the gzip command, but uses different compression algorithms. This algorithm provides high-quality data compression capabilities, but reduces the compression speed. In most cases, its usage is similar to gzip, but the file compressed with bzip2 is suffixed with. bz2.

Command Format

Bzip2 [-cdfkqstvzVL123456789] [filenames...]

Command Parameters

-C -- stdout
Compress or decompress the data to the standard output.

-D -- decompress
Force Extract

-Z -- compress
-D option supplement, force File compression

-T -- test
Integrity check of compressed files

-F -- force
Forcibly overwrite the output file.

-K -- keep
Retain the original file during (unzipping) Compression

-S -- small
Reduce memory usage during compression, decompression, and check.

-Q -- quiet
Do not display warning information

-V -- verbose
Detailed information is displayed during compression.

-L -- license-V -- version
Print version and copyright information

-1 (or -- fast) to-9 (or -- best)
Set the compression level. The larger the value, the slower the compression speed, and the better the compression effect.

Instance

A) compressed file

bkjia@bkjia:~/bkjia/linux/cmdline$ bzip2 foo

B) decompress the file

bkjia@bkjia:~/bkjia/linux/cmdline$ bunzip2 foo.bz2

Related commands

Bunzip2-extract, equivalent to bzip2-d

Bzcat-extract the extracted content to the standard output. bzcat test.bz2 is equivalent to bunzip2-c test.bz2 | cat

Bzip2recover-used to repair corrupted bz2 file data

 

File archiving

Archive is a common file management task used in combination with compression operations. Archiving is a process of gathering numerous files and combining them into a large file.

Tar command format

Tar [OPTION...] [FILE]...

Command Parameters

-A, -- catenate, -- concatenate
Append the tar file to the archive file

-C, -- create
Create a new archive file

-D, -- diff, -- compare
Find the differences between an archive file and a file system

-- Delete
Delete a specified file from an archive file

-R, -- append
Append an object to an archive object

-T, -- list
List the content of an archive object

-U, -- update
Append only files updated compared to archive files

-X, -- extract, -- get
Extract files from archive files

Instance

A) archive foo1, foo2, and foo3 to foo.tar.

bkjia@bkjia:~/bkjia/linux/cmdline$ tar cvf foo.tar foo1 foo2 foo3

B) view the content of the archive file

bkjia@bkjia:~/bkjia/linux/cmdline$ tar tvf foo.tar-rw-rw-r-- bkjia/huey 26840 2015-05-07 19:28 foo1-rw-rw-r-- bkjia/huey 13047 2015-05-07 19:28 foo2-rw-rw-r-- bkjia/huey 348 2015-05-07 19:28 foo3

C) Extract files from archive files

bkjia@bkjia:~/bkjia/linux/cmdline$ tar xvf foo.tar

D) append foo4 to the archive file foo.tar.

bkjia@bkjia:~/bkjia/linux/cmdline$ tar rf foo.tar foo4

E) Delete foo2 from the archive file foo.tar.

bkjia@bkjia:~/bkjia/linux/cmdline$ tar -f foo.tar --delete foo2

F) archive and compress (gzip) files

bkjia@bkjia:~/bkjia/linux/cmdline$ tar zcvf foo.tar.gz foo

G) decompress the .tar.gz file.

bkjia@bkjia:~/bkjia/linux/cmdline$ tar zxvf foo.tar.gz

H) archive and compress (bzip2) files

bkjia@bkjia:~/bkjia/linux/cmdline$ tar jcvf foo.tar.bz2 foo

I) decompress the .tar.bz2 File

bkjia@bkjia:~/bkjia/linux/cmdline$ tar jxvf foo.tar.bz2

Zip command

The zip program is both a File compression tool and a file archiving tool. In Linux, gzip is the main compression command, followed by bzip2. In Linux, zip programs are used to exchange files with Windows systems, rather than compressing or archiving files.

Command Format

Zip [-aABcdDeEfFghjklLmoqrRSTuvVwXyz! @ $] [-- Longoption...] [-B path] [-n suffixes] [-t date] [-tt date] [zipfile [file...] [-xi list]

Unzip [-Z] [-cflptTuvz [abjnoqsCDKLMUVWX $/: ^] file).zip] [file (s)...] [-x xfile (s)...] [-d exdir]

Instance

A) archive foo1, foo2, and foo3 to foo.zip.

bkjia@bkjia:~/bkjia/linux/cmdline$ zip foo.zip foo1 foo2 foo3

B) archive compression directory

bkjia@bkjia:~/bkjia/linux/cmdline$ zip -r commons-beanutils-1.9.2.zip commons-beanutils-1.9.2

C) decompress the. zip file.

bkjia@bkjia:~/bkjia/linux/cmdline$ unzip commons-beanutils-1.9.2.zip

Linux-File compression and Archiving

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