linux bunzip2 命令介绍

Linux 中的 bunzip2 命令用于解压缩使用 bzip2 压缩算法压缩的文件

bunzip2命令 解压缩由bzip2指令创建的”.bz2"压缩包。对文件进行压缩与解压缩。此命令类似于“gzip/gunzip”命令，只能对文件进行压缩。对于目录只能压缩目录下的所有文件，压缩完成后，在目录下生成以“.bz2”为后缀的压缩包。bunzip2其实是bzip2的符号链接，即软链接，因此压缩解压都可以通过bzip2实现

一：安装部署

root@meng:/data# which bunzip2

root@meng:/data# bunzip2

Command 'bunzip2' not found, but can be installed with:

apt install bzip2

root@meng:/data# apt install bzip2

Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

Suggested packages:

bzip2-doc

The following NEW packages will be installed:

bzip2

0 upgraded, 1 newly installed, 0 to remove and 216 not upgraded.

Need to get 34.8 kB of archives.

After this operation, 117 kB of additional disk space will be used.

Get:1 http://mirrors.tuna.tsinghua.edu.cn/ubuntu jammy/main amd64 bzip2 amd64 1.0.8-5build1 [34.8 kB]

Fetched 34.8 kB in 1s (48.5 kB/s)

Selecting previously unselected package bzip2.

(Reading database ... 75058 files and directories currently installed.)

Preparing to unpack .../bzip2_1.0.8-5build1_amd64.deb ...

Unpacking bzip2 (1.0.8-5build1) ...

Setting up bzip2 (1.0.8-5build1) ...

Processing triggers for man-db (2.10.2-1) ...

Scanning processes...

Scanning linux images...

Running kernel seems to be up-to-date.

No services need to be restarted.

No containers need to be restarted.

No user sessions are running outdated binaries.

No VM guests are running outdated hypervisor (qemu) binaries on this host.

二：命令语法

常用选项包括：

root@meng:/data# bunzip2

bunzip2: I won't read compressed data from a terminal.

bunzip2: For help, type: `bunzip2 --help'.

root@meng:/data# bunzip2 --help

bzip2, a block-sorting file compressor. Version 1.0.8, 13-Jul-2019.

usage: bunzip2 [flags and input files in any order]

-h --help print this message

-d --decompress force decompression

-z --compress force compression

-k --keep keep (don't delete) input files

-f --force overwrite existing output files

-t --test test compressed file integrity

-c --stdout output to standard out

-q --quiet suppress noncritical error messages

-v --verbose be verbose (a 2nd -v gives more)

-L --license display software version & license

-V --version display software version & license

-s --small use less memory (at most 2500k)

-1 .. -9 set block size to 100k .. 900k

--fast alias for -1

--best alias for -9

If invoked as `bzip2', default action is to compress.

as `bunzip2', default action is to decompress.

as `bzcat', default action is to decompress to stdout.

If no file names are given, bzip2 compresses or decompresses

from standard input to standard output. You can combine

short flags, so `-v -4' means the same as -v4 or -4v, &c.

三：案例

root@meng:~# ls

0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip meng.txt snap

root@meng:~# bunzip2 meng.txt^C

root@meng:~# bzip2 -9vk meng.txt 0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip

meng.txt: 1.408:1, 5.682 bits/byte, 28.98% saved, 245 in, 174 out.

0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip: 1.019:1, 7.853 bits/byte, 1.84% saved, 20593006 in, 20214290 out.

root@meng:~# ls -h

0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip 0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip.bz2 meng.txt meng.txt.bz2 snap

root@meng:~# ll

total 39988

drwx------ 8 root root 4096 Aug 16 19:32 ./

drwxr-xr-x 20 root root 4096 Aug 14 09:54 ../

-rw------- 1 root root 50831 Aug 15 09:15 .bash_history

-rw-r--r-- 1 root root 3106 Oct 15 2021 .bashrc

drwx------ 2 root root 4096 Jun 25 2023 .cache/

drwx------ 4 root root 4096 Jun 19 17:20 .config/

drwx------ 3 root root 4096 Jun 11 18:18 .docker/

-rw------- 1 root root 20 Jun 7 15:05 .lesshst

-rw-r--r-- 1 root root 161 Jul 9 2019 .profile

drwx------ 2 root root 4096 Apr 19 16:33 .ssh/

drwxr-xr-x 2 root root 4096 Jun 7 15:02 .vim/

-rw------- 1 root root 22185 Aug 13 09:21 .viminfo

-rw-r--r-- 1 root root 165 Jun 7 11:17 .wget-hsts

-rw-r--r-- 1 root root 20593006 Aug 13 09:32 0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip

-rw-r--r-- 1 root root 20214290 Aug 13 09:32 0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip.bz2

-rw-r--r-- 1 root root 245 Aug 13 09:21 meng.txt

-rw-r--r-- 1 root root 174 Aug 13 09:21 meng.txt.bz2

drwx------ 3 root root 4096 Apr 19 14:21 snap/

root@meng:~# bunzip2 meng.txt.bz2

bunzip2: Output file meng.txt already exists.

root@meng:~# bunzip2 -k meng.txt.bz2

bunzip2: Output file meng.txt already exists.

root@meng:~# bunzip2 --keep meng.txt.bz2

bunzip2: Output file meng.txt already exists.

root@meng:~# bunzip2 -f meng.txt.bz2

root@meng:~# ll -h

total 40M

drwx------ 8 root root 4.0K Aug 16 19:34 ./

drwxr-xr-x 20 root root 4.0K Aug 14 09:54 ../

-rw------- 1 root root 50K Aug 15 09:15 .bash_history

-rw-r--r-- 1 root root 3.1K Oct 15 2021 .bashrc

drwx------ 2 root root 4.0K Jun 25 2023 .cache/

drwx------ 4 root root 4.0K Jun 19 17:20 .config/

drwx------ 3 root root 4.0K Jun 11 18:18 .docker/

-rw------- 1 root root 20 Jun 7 15:05 .lesshst

-rw-r--r-- 1 root root 161 Jul 9 2019 .profile

drwx------ 2 root root 4.0K Apr 19 16:33 .ssh/

drwxr-xr-x 2 root root 4.0K Jun 7 15:02 .vim/

-rw------- 1 root root 22K Aug 13 09:21 .viminfo

-rw-r--r-- 1 root root 165 Jun 7 11:17 .wget-hsts

-rw-r--r-- 1 root root 20M Aug 13 09:32 0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip

-rw-r--r-- 1 root root 20M Aug 13 09:32 0c86af62-fd21-4a77-be08-a53c49bd8c8f.zip.bz2

-rw-r--r-- 1 root root 245 Aug 13 09:21 meng.txt

drwx------ 3 root root 4.0K Apr 19 14:21 snap/