diff --git a/sources/tech/20190211 How To Remove-Delete The Empty Lines In A File In Linux.md b/sources/tech/20190211 How To Remove-Delete The Empty Lines In A File In Linux.md deleted file mode 100644 index b55cbcd811..0000000000 --- a/sources/tech/20190211 How To Remove-Delete The Empty Lines In A File In Linux.md +++ /dev/null @@ -1,192 +0,0 @@ -[#]: collector: (lujun9972) -[#]: translator: ( pityonline ) -[#]: reviewer: ( ) -[#]: publisher: ( ) -[#]: url: ( ) -[#]: subject: (How To Remove/Delete The Empty Lines In A File In Linux) -[#]: via: (https://www.2daygeek.com/remove-delete-empty-lines-in-a-file-in-linux/) -[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/) - -How To Remove/Delete The Empty Lines In A File In Linux -====== - -Some times you may wants to remove or delete the empty lines in a file in Linux. - -If so, you can use the one of the below method to achieve it. - -It can be done in many ways but i have listed simple methods in the article. - -You may aware of that grep, awk and sed commands are specialized for textual data manipulation. - -Navigate to the following URL, if you would like to read more about these kind of topics. For **[creating a file in specific size in Linux][1]** multiple ways, for **[creating a file in Linux][2]** multiple ways and for **[removing a matching string from a file in Linux][3]**. - -These are fall in advanced commands category because these are used in most of the shell script to do required things. - -It can be done using the following 5 methods. - - * **`sed Command:`** Stream editor for filtering and transforming text. - * **`grep Command:`** Print lines that match patterns. - * **`cat Command:`** It concatenate files and print on the standard output. - * **`tr Command:`** Translate or delete characters. - * **`awk Command:`** The awk utility shall execute programs written in the awk programming language, which is specialized for textual data manipulation. - * **`perl Command:`** Perl is a programming language specially designed for text editing. - - - -To test this, i had already created the file called `2daygeek.txt` with some texts and empty lines. The details are below. - -``` -$ cat 2daygeek.txt -2daygeek.com is a best Linux blog to learn Linux. - -It's FIVE years old blog. - -This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. - -He got two GIRL babys. - -Her names are Tanisha & Renusha. -``` - -Now everything is ready and i’m going to test this in multiple ways. - -### How To Remove/Delete The Empty Lines In A File In Linux Using sed Command? - -Sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline). - -``` -$ sed '/^$/d' 2daygeek.txt -2daygeek.com is a best Linux blog to learn Linux. -It's FIVE years old blog. -This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. -He got two GIRL babes. -Her names are Tanisha & Renusha. -``` - -Details are follow: - - * **`sed:`** It’s a command - * **`//:`** It holds the searching string. - * **`^:`** Matches start of string. - * **`$:`** Matches end of string. - * **`d:`** Delete the matched string. - * **`2daygeek.txt:`** Source file name. - - - -### How To Remove/Delete The Empty Lines In A File In Linux Using grep Command? - -grep searches for PATTERNS in each FILE. PATTERNS is one or patterns separated by newline characters, and grep prints each line that matches a pattern. - -``` -$ grep . 2daygeek.txt -or -$ grep -Ev "^$" 2daygeek.txt -or -$ grep -v -e '^$' 2daygeek.txt -2daygeek.com is a best Linux blog to learn Linux. -It's FIVE years old blog. -This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. -He got two GIRL babes. -Her names are Tanisha & Renusha. -``` - -Details are follow: - - * **`grep:`** It’s a command - * **`.:`** Replaces any character. - * **`^:`** matches start of string. - * **`$:`** matches end of string. - * **`E:`** For extended regular expressions pattern matching. - * **`e:`** For regular expressions pattern matching. - * **`v:`** To select non-matching lines from the file. - * **`2daygeek.txt:`** Source file name. - - - -### How To Remove/Delete The Empty Lines In A File In Linux Using awk Command? - -The awk utility shall execute programs written in the awk programming language, which is specialized for textual data manipulation. An awk program is a sequence of patterns and corresponding actions. - -``` -$ awk NF 2daygeek.txt -or -$ awk '!/^$/' 2daygeek.txt -or -$ awk '/./' 2daygeek.txt -2daygeek.com is a best Linux blog to learn Linux. -It's FIVE years old blog. -This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. -He got two GIRL babes. -Her names are Tanisha & Renusha. -``` - -Details are follow: - - * **`awk:`** It’s a command - * **`//:`** It holds the searching string. - * **`^:`** matches start of string. - * **`$:`** matches end of string. - * **`.:`** Replaces any character. - * **`!:`** Delete the matched string. - * **`2daygeek.txt:`** Source file name. - - - -### How To Delete The Empty Lines In A File In Linux using Combination of cat And tr Command? - -cat stands for concatenate. It is very frequently used in Linux to reads data from a file. - -cat is one of the most frequently used commands on Unix-like operating systems. It’s offer three functions which is related to text file such as display content of a file, combine multiple files into the single output and create a new file. - -Translate, squeeze, and/or delete characters from standard input, writing to standard output. - -``` -$ cat 2daygeek.txt | tr -s '\n' -2daygeek.com is a best Linux blog to learn Linux. -It's FIVE years old blog. -This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. -He got two GIRL babes. -Her names are Tanisha & Renusha. -``` - -Details are follow: - - * **`cat:`** It’s a command - * **`tr:`** It’s a command - * **`|:`** Pipe symbol. It pass first command output as a input to another command. - * **`s:`** Replace each sequence of a repeated character that is listed in the last specified SET. - * **`\n:`** To add a new line. - * **`2daygeek.txt:`** Source file name. - - - -### How To Remove/Delete The Empty Lines In A File In Linux Using perl Command? - -Perl stands in for “Practical Extraction and Reporting Language”. Perl is a programming language specially designed for text editing. It is now widely used for a variety of purposes including Linux system administration, network programming, web development, etc. - -``` -$ perl -ne 'print if /\S/' 2daygeek.txt -2daygeek.com is a best Linux blog to learn Linux. -It's FIVE years old blog. -This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. -He got two GIRL babes. -Her names are Tanisha & Renusha. -``` - --------------------------------------------------------------------------------- - -via: https://www.2daygeek.com/remove-delete-empty-lines-in-a-file-in-linux/ - -作者：[Magesh Maruthamuthu][a] -选题：[lujun9972][b] -译者：[pityonline](https://github.com/pityonline) -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.2daygeek.com/author/magesh/ -[b]: https://github.com/lujun9972 -[1]: https://www.2daygeek.com/create-a-file-in-specific-certain-size-linux/ -[2]: https://www.2daygeek.com/linux-command-to-create-a-file/ -[3]: https://www.2daygeek.com/empty-a-file-delete-contents-lines-from-a-file-remove-matching-string-from-a-file-remove-empty-blank-lines-from-a-file/ diff --git a/translated/tech/20190211 How To Remove-Delete The Empty Lines In A File In Linux.md b/translated/tech/20190211 How To Remove-Delete The Empty Lines In A File In Linux.md new file mode 100644 index 0000000000..e9e320a97b --- /dev/null +++ b/translated/tech/20190211 How To Remove-Delete The Empty Lines In A File In Linux.md @@ -0,0 +1,194 @@ +[#]: collector: (lujun9972) +[#]: translator: ( pityonline ) +[#]: reviewer: ( ) +[#]: publisher: ( ) +[#]: url: ( ) +[#]: subject: (How To Remove/Delete The Empty Lines In A File In Linux) +[#]: via: (https://www.2daygeek.com/remove-delete-empty-lines-in-a-file-in-linux/) +[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/) + +在 Linux 中如何删除文件中的空行 +====== + +有时你可能需要在 Linux 中删除某个文件中的空行。 + +如果是的，你可以使用下面方法中的其中一个。 + +有很多方法可以做到，但我在这里只是列举一些简单的方法。 + +你可能已经知道 `grep`，`awk` 和 `sed` 命令是专门用来处理文本数据的工具。 + +如果你想了解更多关于这些命令的文章，请访问这几个 URL。**[在 Linux 中创建指定大小的文件的几种方法][1]**，**[在 Linux 中创建一个文件的几种方法][2]** 以及 **[在 Linux 中删除一个文件中的匹配的字符串][3]**。 + +这些属于高级命令，它们可用在大多数 shell 脚本中执行所需的操作。 + +下列 5 种方法可以做到。 + +* **`sed:`** 过滤和替换文本的流编辑器。 +* **`grep:`** 输出匹配到的行。 +* **`cat:`** 合并文件并打印内容到标准输出。 +* **`tr:`** 替换或删除字符。 +* **`awk:`** awk 工具用于执行 awk 语言编写的程序，专门用于文本处理。 +* **`perl:`** Perl 是一种用于处理文本的编程语言。 + +我创建了一个 `2daygeek.txt` 文件来测试这些命令。下面是文件的内容。 + +``` +$ cat 2daygeek.txt +2daygeek.com is a best Linux blog to learn Linux. + +It's FIVE years old blog. + +This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. + +He got two GIRL babys. + +Her names are Tanisha & Renusha. +``` + +现在一切就绪，我们准备开始用多种方法来验证。 + +### 使用 sed 命令 + +sed 是一个流编辑器stream editor。流编辑器是用来编辑输入流（文件或管道）中的文本的。 + +``` +$ sed '/^$/d' 2daygeek.txt +2daygeek.com is a best Linux blog to learn Linux. +It's FIVE years old blog. +This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. +He got two GIRL babes. +Her names are Tanisha & Renusha. +``` + +以下是命令展开的细节： + +* **`sed:`** 该命令本身。 +* **`//:`** 标记匹配范围。 +* **`^:`** 匹配字符串开头。 +* **`$:`** 匹配字符串结尾。 +* **`d:`** 删除匹配的字符串。 +* **`2daygeek.txt:`** 源文件名。 + +### 使用 grep 命令 + +`grep` 可以通过正则表达式在文件中搜索。该表达式可以是一行或多行空行分割的字符，`grep` 会打印所有匹配的内容。 + +``` +$ grep . 2daygeek.txt +or +$ grep -Ev "^$" 2daygeek.txt +or +$ grep -v -e '^$' 2daygeek.txt +2daygeek.com is a best Linux blog to learn Linux. +It's FIVE years old blog. +This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. +He got two GIRL babes. +Her names are Tanisha & Renusha. +``` + +Details are follow: +以下是命令展开的细节： + +* **`grep:`** 该命令本身。 +* **`.:`** 替换任意字符。 +* **`^:`** 匹配字符串开头。 +* **`$:`** 匹配字符串结尾。 +* **`E:`** 使用扩展正则匹配模式。 +* **`e:`** 使用常规正则匹配模式。 +* **`v:`** 反向匹配。 +* **`2daygeek.txt:`** 源文件名。 + +### 使用 awk 命令 + +`awk` 可以执行使用 awk 语言写的脚本，大多是专用于处理文本的。awk 脚本是一系列 awk 命令和正则的组合。 + +``` +$ awk NF 2daygeek.txt +or +$ awk '!/^$/' 2daygeek.txt +or +$ awk '/./' 2daygeek.txt +2daygeek.com is a best Linux blog to learn Linux. +It's FIVE years old blog. +This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. +He got two GIRL babes. +Her names are Tanisha & Renusha. +``` + +以下是命令展开的细节： + +* **`awk:`** 该命令本身。 +* **`//:`** 标记匹配范围。 +* **`^:`** 匹配字符串开头。 +* **`$:`** 匹配字符串结尾。 +* **`.:`** 匹配任意字符。 +* **`!:`** 删除匹配的字符串。 +* **`2daygeek.txt:`** 源文件名。 + +### 使用 cat 和 tr 命令 组合 + +`cat` 是串联（拼接）concatenate的简写。经常用于在 Linux 中读取一个文件的内容。 + +cat 是在类 Unix 系统中使用频率最高的命令之一。它提供了常用的三个处理文本文件的功能：显示文件内容，将多个文件拼接成一个，以及创建一个新文件。 + +tr 可以将标准输入中的字符转换，压缩或删除，然后重定向到标准输出。 + +``` +$ cat 2daygeek.txt | tr -s '\n' +2daygeek.com is a best Linux blog to learn Linux. +It's FIVE years old blog. +This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. +He got two GIRL babes. +Her names are Tanisha & Renusha. +``` + +以下是命令展开的细节： + +* **`cat:`** cat 命令本身。 +* **`tr:`** tr 命令本身。 +* **`|:`** 管道符号。它可以将前面的命令的标准输出作为下一个命令的标准输入。 +* **`s:`** 替换标数据集中任意多个重复字符为一个。 +* **`\n:`** 添加一个新的换行。 +* **`2daygeek.txt:`** 源文件名。 + +### 使用 perl 命令 + +Perl 表示实用的提取和报告语言Practical Extraction and Reporting Language。Perl 在初期被设计为一个专用于文本处理的编程语言，现在已扩展应用到 Linux 系统管理，网络编程和网站开发等多个领域。 + +``` +$ perl -ne 'print if /\S/' 2daygeek.txt +2daygeek.com is a best Linux blog to learn Linux. +It's FIVE years old blog. +This website is maintained by Magesh M, it's licensed under CC BY-NC 4.0. +He got two GIRL babes. +Her names are Tanisha & Renusha. +``` + +以下是命令展开的细节： + +* **`perl:`** perl 命令。 +* **`n:`** 逐行读入数据。 +* **`e:`** 执行某个命令。 +* **`print:`** 打印信息。 +* **`if:`** if 条件分支。 +* **`//:`** 标记匹配范围。 +* **`\S:`** 匹配任意非空白字符。 +* **`2daygeek.txt:`** 源文件名。 + +-------------------------------------------------------------------------------- + +via: https://www.2daygeek.com/remove-delete-empty-lines-in-a-file-in-linux/ + +作者：[Magesh Maruthamuthu][a] +选题：[lujun9972][b] +译者：[pityonline](https://github.com/pityonline) +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.2daygeek.com/author/magesh/ +[b]: https://github.com/lujun9972 +[1]: https://www.2daygeek.com/create-a-file-in-specific-certain-size-linux/ +[2]: https://www.2daygeek.com/linux-command-to-create-a-file/ +[3]: https://www.2daygeek.com/empty-a-file-delete-contents-lines-from-a-file-remove-matching-string-from-a-file-remove-empty-blank-lines-from-a-file/