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[#]: subject: "Replace smart quotes with the Linux sed command"
[#]: via: "https://opensource.com/article/21/9/sed-replace-smart-quotes"
[#]: author: "Seth Kenlon https://opensource.com/users/seth"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
Replace smart quotes with the Linux sed command
======
Banish "smart" quotes with your favorite version of sed.
![Coding on a computer][1]
In typography, a pair of quotation marks were traditionally oriented toward one another. They look like this:
“smart quotes”
As computers became popular in the mid-twentieth century, the orientation was often abandoned. The original character set of computers didn't have much room to spare, so it makes sense that two double-quotes and two single-quotes were reduced down to just one of each in the ASCII specification. These days the common character set is Unicode, with plenty of space for lots of fancy quotation marks and apostrophes, but many people have become used to the minimalism of just one character for both opening and closing quotes. Besides that, computers actually see the different kinds of quotation marks and apostrophes as distinct characters. In other words, to a copmuter the right double quote is different from the left double quote or a straight quote.
### Replacing smart quotes with sed
Computers aren't typewriters. When you press a key on your keyboard, you're not pressing a lever with an inkstamp attached to it. You're just pressing a button that sends a signal to your computer, which the computer interprets as a request to display a specific predefined character. The request depends on your keyboard map. As a Dvorak typist, I've witnessed the confusion on people's faces when they discover "asdf" on my keyboard produces "aoeu" on the screen. You may also have pressed special combinations of keys to produce characters, such as ™ or ß or ≠, that's not even printed on your keyboard.
Each letter or character, whether it's printed on your keyboard or not, has a code. Character encoding can be expressed in different ways, but to a computer the Unicode sequences u2018 and u2019 produce **‘** and **’**, while the codes u201c and u201d produce the **“** and **”** characters. Knowing these "secret" codes means you can replace them programmatically using a command like [sed][2]. Any version of sed will do, so you can use GNU sed or BSD sed or even [Busybox][3] sed.
Here's the simple shell script I use:
```
#!/bin/sh
# GNU All-Permissive License
SDQUO=$(echo -ne '\u2018\u2019')
RDQUO=$(echo -ne '\u201C\u201D')
$SED -i -e "s/[$SDQUO]/\'/g" -e "s/[$RDQUO]/\"/g" "${1}"
```
Save this script as `fixquotes.sh` and then create a separate test file containing smart quotes:
```
‘Single quote’
“Double quote”
```
Run the script, and then use the [cat][4] command to see the results:
```
$ sh ./fixquotes.sh test.txt
$ cat test.txt
'Single quote'
"Double quote"
```
### Install sed
If you’re using Linux, BSD, or macOS, then you already have GNU or BSD `sed` installed. These are two unique reimplementations of the original `sed` command, and for the script in this article they are functionally the same (that's not true for all scripts, though).
On Windows, you can [install GNU sed][5] with [Chocolatey][6].
Vim offers great benefits to writers, regardless of whether they are technically minded or not.
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/9/sed-replace-smart-quotes
作者：[Seth Kenlon][a]
选题：[lujun9972][b]
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://opensource.com/users/seth
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/code_computer_laptop_hack_work.png?itok=aSpcWkcl (Coding on a computer)
[2]: https://opensource.com/article/20/12/sed
[3]: https://opensource.com/article/21/8/what-busybox
[4]: https://opensource.com/article/19/2/getting-started-cat-command
[5]: https://chocolatey.org/packages/sed
[6]: https://opensource.com/article/20/3/chocolatey

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[#]: subject: "Replace smart quotes with the Linux sed command"
[#]: via: "https://opensource.com/article/21/9/sed-replace-smart-quotes"
[#]: author: "Seth Kenlon https://opensource.com/users/seth"
[#]: collector: "lujun9972"
[#]: translator: "geekpi"
[#]: reviewer: " "
[#]: publisher: " "
[#]: url: " "
用 Linux sed 命令替换智能引号
======
用你喜欢的 sed 版本去除“智能”引号。
![Coding on a computer][1]
In typography, a pair of quotation marks were traditionally oriented toward one another. They look like this:
在排版学中，一对引号传统上是朝向彼此的。它们看起来像这样：
“智能引号”
随着计算机在二十世纪中期的普及，这种方向往往被放弃了。计算机的原始字符集没有太多的空间，所以在 ASCII 规范中，两个双引号和两个单引号被缩减为各一个是合理的。如今，通用的字符集是 Unicode，有足够的空间容纳许多花哨的引号和撇号，但许多人已经习惯了开头和结尾引号都只有一个字符的极简主义。此外，计算机实际上将不同种类的引号和撇号视为不同的字符。换句话说，对计算机来说，右双引号与左双引号或直引号是不同的。
### 用 sed 替换智能引号
计算机并不是打字机。当你按下键盘上的一个键时，你不是在按一个带有印章的控制杆。你只是按下一个按钮，向你的计算机发送一个信号，计算机将其解释为一个显示特定预定义字符的请求。这个请求取决于你的键盘映射。作为一个 Dvorak 打字员，我目睹了人们在发现我的键盘上的 “asdf” 在屏幕上产生 “aoeu” 时脸上的困惑。你也可能按了一些特殊的组合键来产生字符，如 ™ 或 ß 或 ≠，这甚至没有印在你的键盘上。
每个字母或字符，不管它是否印在你的键盘上，都有一个编码。字符编码可以用不同的方式表达，但对计算机来说，Unicode 序列 u2018 和 u2019 产生 **‘** 和 **’**，而代码 u201c 和 u201d 产生 **“** 和 **”** 字符。知道这些“秘密”代码意味着你可以使用 [sed][2] 这样的命令以编程方式替换它们。任何版本的 sed 都可以，所以你可以使用 GNU sed 或 BSD sed，甚至是 [Busybox][3] sed。
下面是我使用的简单的 shell 脚本：
```
#!/bin/sh
# GNU All-Permissive License
SDQUO=$(echo -ne '\u2018\u2019')
RDQUO=$(echo -ne '\u201C\u201D')
$SED -i -e "s/[$SDQUO]/\'/g" -e "s/[$RDQUO]/\"/g" "${1}"
```
将此脚本保存为 `fixquotes.sh`，然后创建一个包含智能引号的单独测试文件：
```
‘Single quote’
“Double quote”
```
运行该脚本，然后使用 [cat][4] 命令查看结果：
```
$ sh ./fixquotes.sh test.txt
$ cat test.txt
'Single quote'
"Double quote"
```
### 安装 sed
如果你使用的是 Linux、BSD 或 macOS，那么你已经安装了 GNU 或 BSD 的 `sed`。这是原始 `sed` 命令的两个独特的重新实现，对于本文中的脚本来说，它们在功能上是一样的(不过并不是所有的脚本都是这样)。
在 Windows 上，你可以用 [Chocolatey][6] [安装 GNU sed][5]。
--------------------------------------------------------------------------------
via: https://opensource.com/article/21/9/sed-replace-smart-quotes
作者：[Seth Kenlon][a]
选题：[lujun9972][b]
译者：[geekpi](https://github.com/geekpi)
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://opensource.com/users/seth
[b]: https://github.com/lujun9972
[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/code_computer_laptop_hack_work.png?itok=aSpcWkcl (Coding on a computer)
[2]: https://opensource.com/article/20/12/sed
[3]: https://opensource.com/article/21/8/what-busybox
[4]: https://opensource.com/article/19/2/getting-started-cat-command
[5]: https://chocolatey.org/packages/sed
[6]: https://opensource.com/article/20/3/chocolatey