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translating---geekpi
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How to Search PDF Files from the Terminal with pdfgrep
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======
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Command line utilities such as [grep][1] and [ack-grep][2] are great for searching plain-text files for patterns matching a specified [regular expression][3]. But have you ever tried using these utilities to search for patterns in a PDF file? Well, don't! You will not get any result as these tools cannot read PDF files; they only read plain-text files.
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[pdfgrep][4], as the name suggests, is a small command line utility that makes it possible to search for text in a PDF file without opening the file. It is insanely fast - faster than the search provided by virtually all PDF document viewers. A great distinction between grep and pdfgrep is that pdfgrep operates on pages, whereas grep operates on lines. It also prints a single line multiple times if more than one match is found on that line. Let's look at how exactly to use the tool.
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For Ubuntu and other Linux distros based on Ubuntu, it is pretty simple:
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```
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sudo apt install pdfgrep
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```
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For other distros, just provide `pdfgrep` as input for the [package manager][5], and that should get it installed. You can also check out the project's [GitLab page][6], in case you want to play around with the code.
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Now that you have the tool installed, let's go for a test run. pdfgrep command takes this format:
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```
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pdfgrep [OPTION...] PATTERN [FILE...]
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```
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**OPTION** is a list of extra attributes to give the command such as `-i` or `--ignore-case`, which both ignore the case distinction between the regular pattern specified and the once matching it from the file.
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**PATTERN** is just an extended regular expression.
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**FILE** is just the name of the file, if it is in the same working directory, or the path to the file.
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I ran the command on Python 3.6 official documentation. The following image is the result.
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![pdfgrep search][7]
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![pdfgrep search][7]
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The red highlights indicate all the places the word "queue" was encountered. Passing `-i` as option to the command included matches of the word "Queue." Remember, the case does not matter when `-i` is passed as an option.
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pdfgrep has quite a number of interesting options to use. However, I'll cover only a few here.
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* `-c` or `--count`: this suppresses the normal output of matches. Instead of displaying the long output of the matches, it only displays a value representing the number of times the word was encountered in the file
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* `-p` or `--page-count`: this option prints out the page numbers of matches and the number of occurrences of the pattern on the page
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* `-m` or `--max-count` [number]: specifies the maximum number of matches. That means when the number of matches is reached, the command stops reading the file.
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The full list of supported options can be found in the man pages or in the pdfgrep online [documenation][8]. Don't forget pdfgrep can search multiple files at the same time, in case you're working with some bulk files. The default match highlight color can be changed by altering the GREP_COLORS environment variable.
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The next time you think of opening up a PDF file to search for anything. think of using pdfgrep. The tool comes in handy and will save you time.
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--------------------------------------------------------------------------------
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via: https://www.maketecheasier.com/search-pdf-files-pdfgrep/
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作者：[Bruno Edoh][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.maketecheasier.com
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[1] https://www.maketecheasier.com/what-is-grep-and-uses/
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[2] https://www.maketecheasier.com/ack-a-better-grep/
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[3] https://www.maketecheasier.com/the-beginner-guide-to-regular-expressions/
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[4] https://pdfgrep.org/
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[5] https://www.maketecheasier.com/install-software-in-various-linux-distros/
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[6] https://gitlab.com/pdfgrep/pdfgrep
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[7] https://www.maketecheasier.com/assets/uploads/2017/11/pdfgrep-screenshot.png (pdfgrep search)
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[8] https://pdfgrep.org/doc.html
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@ -1,3 +1,5 @@
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translating---geekpi
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Surf anonymously: Learn to install TOR network on Linux
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======
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Tor Network is an anonymous network to secure your internet & privacy. Tor network is a group of volunteer operated servers. Tor protects internet communication by bouncing it around a distributed network of relay system run by volunteers. This prevents us from people snooping the internet, they can't learn what site we visit or where is the user physically & it also allows us to use blocked websites.
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如何使用 pdfgrep 从终端搜索 PDF 文件
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======
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诸如 [grep][1] 和 [ack-grep][2] 之类的命令行工具对于搜索匹配指定[正则表达式][3]的纯文本非常有用。但是你有没有试过使用这些工具在 PDF 中搜索模板？不要这么做！由于这些工具无法读取PDF文件，因此你不会得到任何结果。他们只能读取纯文本文件。
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顾名思义，[pdfgrep][4] 是一个小的命令行程序，可以在不打开文件的情况下搜索 PDF 中的文本。它非常快速 - 比几乎所有 PDF 浏览器提供的搜索更快。grep 和 pdfgrep 的区别在于 pdfgrep 对页进行操作，而 grep 对行操作。grep 如果在一行上找到多个匹配项，它也会多次打印单行。让我们看看如何使用该工具。
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对于 Ubuntu 和其他基于 Ubuntu 的 Linux 发行版来说，这非常简单：
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```
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sudo apt install pdfgrep
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```
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对于其他发行版，只要将 `pdfgrep` 作为[包管理器][5]的输入，它就应该能够安装。万一你想浏览代码，你也可以查看项目的[ GitLab 页面][6]。
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现在你已经安装了这个工具，让我们去测试一下。pdfgrep 命令采用以下格式：
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```
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pdfgrep [OPTION...] PATTERN [FILE...]
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```
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**OPTION** 是一个额外的属性列表，给出诸如 `-i` 或 `--ignore-case` 这样的命令，这两者都会忽略匹配正则中的大小写。
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**PATTERN** 是一个扩展的正则表达式。
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**FILE** 如果它在相同的工作目录或文件的路径，这是文件的名称。
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我根据官方文档用 Python 3.6 运行命令。下图是结果。
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![pdfgrep search][7]
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![pdfgrep search][7]
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红色高亮显示所有遇到单词 “queue” 的地方。在命令中加入 `-i` 选项将会匹配单词 “Queue”。请记住，当加入 `-i` 时，大小写并不重要。
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pdfgrep 有相当多的有趣的选项。不过，我只会在这里介绍几个。
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* `-c` 或者 `--count`：这会抑制匹配的正常输出。它只显示在文件中遇到该单词的次数，而不是显示匹配的长输出，
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* `-p` 或者 `--page-count`：这个选项打印页面上匹配的页码和页面上的模式出现次数
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* `-m` 或者 `--max-count` [number]：指定匹配的最大数目。这意味着当达到匹配次数时，该命令停止读取文件。
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支持的选项的完整列表可以在 man 页面或者 pdfgrep 在线[文档][8]中找到。以防你在处理一些批量文件，不要忘记，pdfgrep 可以同时搜索多个文件。可以通过更改 GREP_COLORS 环境变量来更改默认的匹配高亮颜色。
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下一次你想在 PDF 中搜索一些东西。请考虑使用 pdfgrep。该工具会派上用场，并且节省你的时间。
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--------------------------------------------------------------------------------
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via: https://www.maketecheasier.com/search-pdf-files-pdfgrep/
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作者：[Bruno Edoh][a]
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译者：[geekpi](https://github.com/geekpi)
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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.maketecheasier.com
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[1] https://www.maketecheasier.com/what-is-grep-and-uses/
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[2] https://www.maketecheasier.com/ack-a-better-grep/
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[3] https://www.maketecheasier.com/the-beginner-guide-to-regular-expressions/
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[4] https://pdfgrep.org/
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[5] https://www.maketecheasier.com/install-software-in-various-linux-distros/
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[6] https://gitlab.com/pdfgrep/pdfgrep
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[7] https://www.maketecheasier.com/assets/uploads/2017/11/pdfgrep-screenshot.png (pdfgrep search)
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[8] https://pdfgrep.org/doc.html
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