From 4c146c68eac8e5f0dc6c424b4e41cb911b1b0d87 Mon Sep 17 00:00:00 2001 From: darksun Date: Sat, 6 Jan 2018 13:09:40 +0800 Subject: [PATCH] =?UTF-8?q?=E9=80=89=E9=A2=98:=20Linux=20Gunzip=20Command?= =?UTF-8?q?=20Explained=20with=20Examples?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ... Gunzip Command Explained with Examples.md | 100 ++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 sources/tech/20171002 Linux Gunzip Command Explained with Examples.md diff --git a/sources/tech/20171002 Linux Gunzip Command Explained with Examples.md b/sources/tech/20171002 Linux Gunzip Command Explained with Examples.md new file mode 100644 index 0000000000..cab0c84bd7 --- /dev/null +++ b/sources/tech/20171002 Linux Gunzip Command Explained with Examples.md @@ -0,0 +1,100 @@ +Linux Gunzip Command Explained with Examples +====== + +We have [already discussed][1] the **gzip** command in Linux. For starters, the tool is used to compress or expand files. To uncompress, the command offers a command line option **-d** , which can be used in the following way: + +gzip -d [compressed-file-name] + +However, there's an entirely different tool that you can use for uncompressing or expanding archives created by gzip. The tool in question is **gunzip**. In this article, we will discuss the gunzip command using some easy to understand examples. Please note that all examples/instructions mentioned in the tutorial have been tested on Ubuntu 16.04. + +### Linux gunzip command + +So now we know that compressed files can be restored using either 'gzip -d' or the gunzip command. The basic syntax of gunzip is: + +gunzip [compressed-file-name] + +The following Q&A-style examples should give you a better idea of how the tool works: + +### Q1. How to uncompress archives using gunzip? + +This is very simple - just pass the name of the archive file as argument to gunzip. + +gunzip [archive-name] + +For example: + +gunzip file1.gz + +[![How to uncompress archives using gunzip][2]][3] + +### Q2. How to make gunzip not delete archive file? + +As you'd have noticed, the gunzip command deletes the archive file after uncompressing it. However, if you want the archive to stay, you can do that using the **-c** command line option. + +gunzip -c [archive-name] > [outputfile-name] + +For example: + +gunzip -c file1.gz > file1 + +[![How to make gunzip not delete archive file][4]][5] + +So you can see that the archive file wasn't deleted in this case. + +### Q3. How to make gunzip put the uncompressed file in some other directory? + +We've already discussed the **-c** option in the previous Q &A. To make gunzip put the uncompressed file in a directory other than the present working directory, just provide the absolute path after the redirection operator. + +gunzip -c [compressed-file] > [/complete/path/to/dest/dir/filename] + +Here's an example: + +gunzip -c file1.gz > /home/himanshu/file1 + +### More info + +The following details - taken from the common manpage of gzip/gunzip - should be beneficial for those who want to know more about the command: +``` + gunzip takes a list of files on its command line and replaces each file +       whose  name ends with .gz, -gz, .z, -z, or _z (ignoring case) and which +       begins with the correct magic number with an uncompressed file  without +       the  original extension.  gunzip also recognizes the special extensions +       .tgz and .taz as shorthands for .tar.gz and .tar.Z respectively.   When +       compressing, gzip uses the .tgz extension if necessary instead of trun +       cating a file with a .tar extension. + +       gunzip can currently decompress files created by gzip,  zip,  compress, +       compress  -H  or pack.  The detection of the input format is automatic. +       When using the first two formats, gunzip checks a 32 bit CRC. For  pack +       and gunzip checks the uncompressed length. The standard compress format +       was not designed to allow consistency checks. However gunzip  is  some +       times  able  to  detect  a bad .Z file. If you get an error when uncom +       pressing a .Z file, do not assume that the .Z file  is  correct  simply +       because the standard uncompress does not complain. This generally means +       that the standard uncompress does not check its input, and happily gen +       erates  garbage  output.   The  SCO compress -H format (lzh compression +       method) does not include a CRC but also allows some consistency checks. +``` + +### Conclusion + +As far as basic usage is concerned, there isn't much of a learning curve associated with Gunzip. We've covered pretty much everything that a beginner needs to learn about this command in order to start using it. For more information, head to its [man page][6]. + + +-------------------------------------------------------------------------------- + +via: https://www.howtoforge.com/linux-gunzip-command/ + +作者：[Himanshu Arora][a] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]:https://www.howtoforge.com +[1]:https://www.howtoforge.com/linux-gzip-command/ +[2]:https://www.howtoforge.com/images/linux_gunzip_command/gunzip-basic-usage.png +[3]:https://www.howtoforge.com/images/linux_gunzip_command/big/gunzip-basic-usage.png +[4]:https://www.howtoforge.com/images/linux_gunzip_command/gunzip-c.png +[5]:https://www.howtoforge.com/images/linux_gunzip_command/big/gunzip-c.png +[6]:https://linux.die.net/man/1/gzip