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101 lines
4.7 KiB
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Linux Gunzip Command Explained with Examples
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======
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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:
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gzip -d [compressed-file-name]
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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.
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### Linux gunzip command
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So now we know that compressed files can be restored using either 'gzip -d' or the gunzip command. The basic syntax of gunzip is:
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gunzip [compressed-file-name]
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The following Q&A-style examples should give you a better idea of how the tool works:
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### Q1. How to uncompress archives using gunzip?
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This is very simple - just pass the name of the archive file as argument to gunzip.
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gunzip [archive-name]
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For example:
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gunzip file1.gz
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[![How to uncompress archives using gunzip][2]][3]
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### Q2. How to make gunzip not delete archive file?
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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.
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gunzip -c [archive-name] > [outputfile-name]
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For example:
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gunzip -c file1.gz > file1
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[![How to make gunzip not delete archive file][4]][5]
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So you can see that the archive file wasn't deleted in this case.
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### Q3. How to make gunzip put the uncompressed file in some other directory?
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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.
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gunzip -c [compressed-file] > [/complete/path/to/dest/dir/filename]
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Here's an example:
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gunzip -c file1.gz > /home/himanshu/file1
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### More info
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The following details - taken from the common manpage of gzip/gunzip - should be beneficial for those who want to know more about the command:
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```
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gunzip takes a list of files on its command line and replaces each file
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whose name ends with .gz, -gz, .z, -z, or _z (ignoring case) and which
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begins with the correct magic number with an uncompressed file without
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the original extension. gunzip also recognizes the special extensions
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.tgz and .taz as shorthands for .tar.gz and .tar.Z respectively. When
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compressing, gzip uses the .tgz extension if necessary instead of trun
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cating a file with a .tar extension.
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gunzip can currently decompress files created by gzip, zip, compress,
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compress -H or pack. The detection of the input format is automatic.
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When using the first two formats, gunzip checks a 32 bit CRC. For pack
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and gunzip checks the uncompressed length. The standard compress format
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was not designed to allow consistency checks. However gunzip is some
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times able to detect a bad .Z file. If you get an error when uncom
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pressing a .Z file, do not assume that the .Z file is correct simply
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because the standard uncompress does not complain. This generally means
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that the standard uncompress does not check its input, and happily gen
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erates garbage output. The SCO compress -H format (lzh compression
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method) does not include a CRC but also allows some consistency checks.
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```
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### Conclusion
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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].
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--------------------------------------------------------------------------------
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via: https://www.howtoforge.com/linux-gunzip-command/
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作者：[Himanshu Arora][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://www.howtoforge.com
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[1]:https://www.howtoforge.com/linux-gzip-command/
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[2]:https://www.howtoforge.com/images/linux_gunzip_command/gunzip-basic-usage.png
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[3]:https://www.howtoforge.com/images/linux_gunzip_command/big/gunzip-basic-usage.png
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[4]:https://www.howtoforge.com/images/linux_gunzip_command/gunzip-c.png
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[5]:https://www.howtoforge.com/images/linux_gunzip_command/big/gunzip-c.png
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[6]:https://linux.die.net/man/1/gzip
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