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Translating by GOLinux!
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Linux FAQs with Answers--How to view torrent file content on Linux
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================================================================================
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> **Question**: I have a torrent file downloaded from the web. Is there a tool that allows me to view the content of a torrent on Linux? For example, I want to know what files are included inside a torrent.
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A torrent file (i.e., a file with **.torrent** extension) is a BitTorrent metadata file which stores information (e.g., tracker URLs, file list, sizes, checksums, creation date) needed by a BitTorrent client to download files shared on BitTorrent peer-to-peer networks. Inside a single torrent file, one or more files can be listed for sharing.
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The content of a torrent file is encoded with BEncode, the BitTorrent's data serialization format. Thus to view the content of a torrent file, you need a corresponding decoder.
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In fact, any GUI-based BitTorrent client (e.g., Transmission or uTorrent) is equipped with BEncode decoder, so can show to you the content of a torrent file by opening it. However, if you don't want to use any sort of BitTorrent client to check up on a torrent file, you can try a command-line torrent viewer called [dumptorrent][2].
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The **dumptorrent** command prints the detailed content of a torrent file (e.g., file names, sizes, tracker URLs, creation date, info hash, etc.) by using a built-in BEncode decoder.
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### Install DumpTorrent on Linux ###
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To install dumptorrent on Linux, you can build it from the source.
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On Debian, Ubuntu or Linux Mint:
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$ sudo apt-get install gcc make
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$ wget http://downloads.sourceforge.net/project/dumptorrent/dumptorrent/1.2/dumptorrent-1.2.tar.gz
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$ tar -xvf dumptorrent-1.2.tar.gz
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$ cd dumptorrent-1.2
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$ make
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$ sudo cp dumptorrent /usr/local/bin
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On CentOS, Fedora or RHEL:
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$ sudo yum install gcc make
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$ wget http://downloads.sourceforge.net/project/dumptorrent/dumptorrent/1.2/dumptorrent-1.2.tar.gz
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$ tar -xvf dumptorrent-1.2.tar.gz
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$ cd dumptorrent-1.2
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$ make
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$ sudo cp dumptorrent /usr/local/bin
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Make sure that /usr/local/bin is [included][2] in your PATH.
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### View the Content of a Torrent ###
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To check the content of a torrent, simply run dumptorrent with a torrent file as an argument. This will print a summary of a torrent, including file names, sizes and tracker URL.
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$ dumptorrent <torrent-file>
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To view the full content of a torrent, add "-v" option. This will print more detailed information of a torrent, including info-hash, piece length, creation date, creator, and full announce list.
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$ dumptorrent -v <torrent-file>
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/view-torrent-file-content-linux.html
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作者：[Dan Nanni][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) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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[1]:http://dumptorrent.sourceforge.net/
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[2]:http://ask.xmodulo.com/change-path-environment-variable-linux.html
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Linux有问必答——Linux上如何查看torrent文件内容
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================================================================================
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> **问题**： 我从网站上下载了一个torrent文件。Linux上有没有工具让我查看torrent文件的内容？例如，我想知道torrent里面都有什么文件。
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torrent文件（也就是扩展名为**.torrent**的文件）是BitTorrent元数据文件，里面存储了BitTorrent客户端用来从BitTorrent点对点网络下载共享文件的信息（如，追踪器URL、文件列表、大小、校验和、创建日期等）。在单个torrent文件里面，可以列出一个或多个文件用于共享。
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torrent文件内容由BEncode编码为BitTorrent数据序列化格式，因此，要查看torrent文件的内容，你需要相应的解码器。
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事实上，任何图形化的BitTorrent客户端（如Transmission或uTorrent）都带有BEncode解码器，所以，你可以用它们直接打开来查看torrent文件的内容。然而，如果你不想要使用BitTorrent客户端来检查torrent文件，你可以试试这个命令行torrent查看器，它叫[dumptorrent][1]。
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**dumptorrent**命令可以使用内建的BEncode解码器打印torrent文件的详细信息（如，文件名、大小、跟踪器URL、创建日期、信息散列等等）。
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### 安装DumpTorrent到Linux ###
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要安装dumptorrent到Linux，你可以从源代码来构建它。
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在Debian、Ubuntu或Linux Mint上：
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$ sudo apt-get install gcc make
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$ wget http://downloads.sourceforge.net/project/dumptorrent/dumptorrent/1.2/dumptorrent-1.2.tar.gz
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$ tar -xvf dumptorrent-1.2.tar.gz
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$ cd dumptorrent-1.2
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$ make
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$ sudo cp dumptorrent /usr/local/bin
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在CentOS、Fedora或RHEL上：
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$ sudo yum install gcc make
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$ wget http://downloads.sourceforge.net/project/dumptorrent/dumptorrent/1.2/dumptorrent-1.2.tar.gz
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$ tar -xvf dumptorrent-1.2.tar.gz
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$ cd dumptorrent-1.2
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$ make
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$ sudo cp dumptorrent /usr/local/bin
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确保你的路径中[包含][2]了/usr/local/bin。
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### 查看torrent的内容 ###
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要检查torrent的内容，只需要运行dumptorrent，并将torrent文件作为参数执行。这会打印出torrent的概要，包括文件名、大小和跟踪器URL。
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$ dumptorrent <torrent-file>
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要查看torrent的完整内容，请添加“-v”选项。它会打印更多关于torrent的详细信息，包括信息散列、片长度、创建日期、创建者，以及完整的声明列表。
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$ dumptorrent -v <torrent-file>
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--------------------------------------------------------------------------------
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via: http://ask.xmodulo.com/view-torrent-file-content-linux.html
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作者：[Dan Nanni][a]
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译者：[GOLinux](https://github.com/GOLinux)
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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) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://ask.xmodulo.com/author/nanni
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[1]:http://dumptorrent.sourceforge.net/
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[2]:http://ask.xmodulo.com/change-path-environment-variable-linux.html
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@ -1,23 +1,20 @@
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translating by cvsher
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Linux grep command with 14 different examples
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================================================================================
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### Overview : ###
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###概述：###
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Linux like operating system provides a searching tool known as **grep (global regular expression print)**. grep command is useful for searching the content of one more files based on the pattern. A pattern may be a single character, bunch of characters, single word or a sentence.
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所有类linux系统都会提供一个名为**grep(global regular expression print)**的搜索工具。grep命令在基于模式对一个或多个文件内容进行搜索的情况下是非常有用的。一个模式可以是单个字符、多个字符、单个单词、或者是一个句子。
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When we execute the grep command with specified pattern, if its is matched, then it will display the line of file containing the pattern without modifying the contents of existing file.
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当命令匹配到执行命令时指定的模式时，grep会将包含模式的一行输出，但是并不对原文件内容进行修改。
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In this tutorial we will discuss 14 different examples of grep command
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在本文中，我们将会讨论到14个grep命令的例子。
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### Example:1 Search the pattern (word) in a file ###
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###1 在文件中查找模式（单词）###
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Search the “linuxtechi” word in the file /etc/passwd file
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在/etc/passwd文件中查找单词“linuxtechi”
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root@Linux-world:~# grep linuxtechi /etc/passwd
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linuxtechi:x:1000:1000:linuxtechi,,,:/home/linuxtechi:/bin/bash
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root@Linux-world:~#
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### Example:2 Search the pattern in the multiple files. ###
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###2 在多个文件中查找模式。###
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root@Linux-world:~# grep linuxtechi /etc/passwd /etc/shadow /etc/gshadow
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/etc/passwd:linuxtechi:x:1000:1000:linuxtechi,,,:/home/linuxtechi:/bin/bash
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@ -31,14 +28,14 @@ Search the “linuxtechi” word in the file /etc/passwd file
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/etc/gshadow:sambashare:!::linuxtechi
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root@Linux-world:~#
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### Example:3 List the name of those files which contain a specified pattern using -l option. ###
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###3 使用-l参数列出包含指定模式的文件的文件名。###
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root@Linux-world:~# grep -l linuxtechi /etc/passwd /etc/shadow /etc/fstab /etc/mtab
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/etc/passwd
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/etc/shadow
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root@Linux-world:~#
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### Example:4 Search the pattern in the file along with associated line number(s) using the -n option ###
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###4 使用-n参数，在文件中查找指定模式及其相关的行号###
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root@Linux-world:~# grep -n linuxtechi /etc/passwd
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39:linuxtechi:x:1000:1000:linuxtechi,,,:/home/linuxtechi:/bin/bash
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@ -48,34 +45,35 @@ root@Linux-world:~# grep -n root /etc/passwd /etc/shadow
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### Example:5 Print the line excluding the pattern using -v option ###
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###5 使用-v参数输出不包含指定模式的行###
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List all the lines of the file /etc/passwd that does not contain specific word “linuxtechi”.
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输出/etc/passwd文件中所有不含单词“linuxtechi”的行
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root@Linux-world:~# grep -v linuxtechi /etc/passwd
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### Example:6 Display all the lines that starts with specified pattern using ^ symbol ###
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###6 使用^符号输出所有以某指定模式开头的行###
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Bash shell treats carrot symbol (^) as a special character which marks the beginning of line or a word. Let’s display the lines which starts with “root” word in the file /etc/passwd.
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Bash脚本将^符号当作特殊字符处理，用于指定一行或者一个单词的开始。例如输出/etc/passes文件中所有以“root”开头的行
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root@Linux-world:~# grep ^root /etc/passwd
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root:x:0:0:root:/root:/bin/bash
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root@Linux-world:~#
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### Example: 7 Display all the lines that ends with specified pattern using $ symbol. ###
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###7 使用 $ 符号输出所有以指定模式结尾的行。###
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List all the lines of /etc/passwd that ends with “bash” word.
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输出/etc/passwd文件中所有以“bash”结尾的行。
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root@Linux-world:~# grep bash$ /etc/passwd
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root:x:0:0:root:/root:/bin/bash
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linuxtechi:x:1000:1000:linuxtechi,,,:/home/linuxtechi:/bin/bash
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root@Linux-world:~#
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Bash shell treats dollar ($) symbol as a special character which marks the end of line or word.
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Bash脚本将美元($)符号当作特殊字符，用于指定一行或者一个单词的结尾。
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###8 使用 -r 参数递归的查找特定模式###
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### Example:8 Search the pattern recursively using -r option ###
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root@Linux-world:~# grep -r linuxtechi /etc/
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/etc/subuid:linuxtechi:100000:65536
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@ -91,37 +89,37 @@ Bash shell treats dollar ($) symbol as a special character which marks the end o
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/etc/passwd:linuxtechi:x:1000:1000:linuxtechi,,,:/home/linuxtechi:/bin/bash
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............................................................................
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Above command will search linuxtechi in the “/etc” directory recursively.
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上面的命令将会递归的在/etc目录中查找“linuxtechi”单词
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### Example:9 Search all the empty or blank lines of a file using grep ###
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###9 使用grep查找文件中所有的空行
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root@Linux-world:~# grep ^$ /etc/shadow
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root@Linux-world:~#
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As there is no empty line in /etc/shadow file , so nothing is displayed.
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由于/etc/shadow文件中没有空行，所以没有任何输出
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### Example:10 Search the pattern using ‘grep -i’ option. ###
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###10 使用“grep -i”参数查找模式###
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-i option in the grep command ignores the letter case i.e it will ignore upper case or lower case letters while searching
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grep命令的-i参数在查找时忽略字符的大小写。
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Lets take an example , i want to search “LinuxTechi” word in the passwd file.
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我们来看一个例子，在paswd文件中查找“LinuxTechi”单词。
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nextstep4it@localhost:~$ grep -i LinuxTechi /etc/passwd
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linuxtechi:x:1001:1001::/home/linuxtechi:/bin/bash
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nextstep4it@localhost:~$
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### Example:11 Search multiple patterns using -e option ###
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###11 使用-e参数查找多个模式###
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For example i want to search ‘linuxtechi’ and ‘root’ word in a single grep command , then using -e option we can search multiple patterns .
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例如，我想在一条grep命令中查找‘linuxtechi’和‘root’单词，使用-e参数，我们可以查找多个模式。
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root@Linux-world:~# grep -e "linuxtechi" -e "root" /etc/passwd
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root:x:0:0:root:/root:/bin/bash
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linuxtechi:x:1000:1000:linuxtechi,,,:/home/linuxtechi:/bin/bash
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root@Linux-world:~#
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### Example:12 Getting Search pattern from a file using “grep -f” ###
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###12 使用“grep -f”从一个文件中获取待查找的模式###
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First create a search pattern file “grep_pattern” in your current working directory. In my case i have put the below contents.
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首先，在当前目录中创建一个搜索模式文件“grep_pattern”，我想文件中输入的如下内容。
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root@Linux-world:~# cat grep_pattern
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^linuxtechi
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@ -129,35 +127,35 @@ First create a search pattern file “grep_pattern” in your current working di
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false$
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root@Linux-world:~#
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Now try to search using grep_pattern file.
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现在，试试使用grep_pattern文件进行搜索
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root@Linux-world:~# grep -f grep_pattern /etc/passwd
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### Example:13 Count the number of matching patterns using -c option ###
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###13 使用-c参数计算模式匹配的数量###
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Let take the above example , we can count the number of matching patterns using -c option in grep command.
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继续上面例子，我们在grep命令中使用-c命令计算匹配指定模式的数量
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root@Linux-world:~# grep -c -f grep_pattern /etc/passwd
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22
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root@Linux-world:~#
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### Example:14 Display N number of lines before & after pattern matching ###
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###14 输出匹配指定模式行的前或者后面N行###
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a) Display Four lines before patten matching using -B option
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a)使用-B参数输出匹配行的前4行
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root@Linux-world:~# grep -B 4 "games" /etc/passwd
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b) Display Four lines after pattern matching using -A option
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b)使用-A参数输出匹配行的后4行
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root@Linux-world:~# grep -A 4 "games" /etc/passwd
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c) Display Four lines around the pattern matching using -C option
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c)使用-C参数输出匹配行的前后各4行
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root@Linux-world:~# grep -C 4 "games" /etc/passwd
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@ -168,7 +166,7 @@ c) Display Four lines around the pattern matching using -C option
|
||||
via: http://www.linuxtechi.com/linux-grep-command-with-14-different-examples/
|
||||
|
||||
作者：[Pradeep Kumar][a]
|
||||
译者：[译者ID](https://github.com/译者ID)
|
||||
译者：[cvsher](https://github.com/cvsher)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
|
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