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-[#]: subject: "Bash Basics Series #2: Using Variables in Bash"
-[#]: via: "https://itsfoss.com/bash-use-variables/"
-[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/"
-[#]: collector: "lkxed"
-[#]: translator: "geekpi"
-[#]: reviewer: " "
-[#]: publisher: " "
-[#]: url: " "
-
-Bash Basics Series #2: Using Variables in Bash
-======
-
-In the first part of the Bash Basics Series, I briefly mentioned variables. It is time to take a detailed look at them in this chapter.
-
-If you have ever done any kind of coding, you must be familiar with the term 'variable'.
-
-If not, think of a variable as a box that holds up information, and this information can be changed over time.
-
-Let's see about using them.
-
-### Using variables in Bash shell
-
-Open a terminal and use initialize a variable with a random number 4:
-
-```
-var=4
-```
-
-So now you have a variable named `var` and its value is `4`. Want to verify it? **Access the value of a variable by adding $ before the variable name**. It's called parameter expansion.
-
-```
-[email protected]:~$ echo The value of var is $var
-The value of var is 4
-```
-
-> 🚧 There must NOT be a space before or after`=`during variable initialization.
-
-If you want, you can change the value to something else:
-
-![Using variables in shell][1]
-
-In Bash shell, a variable can be a number, character, or string (of characters including spaces).
-
-![Different variable types in Bash shell][2]
-
-> 💡 Like other things in Linux, the variable names are also case-sensitive. They can consist of letters, numbers and the underscore "_".
-
-### Using variables in Bash scripts
-
-Did you notice that I didn't run a shell script to show the variable examples? You can do a lot of things in the shell directly. When you close the terminal, those variables you created will no longer exist.
-
-However, your distro usually adds global variables so that they can be accessed across all of your scripts and shells.
-
-Let's write some scripts again. You should have the script directory created earlier but this command will take care of that in either case:
-
-```
-mkdir -p bash_scripts && cd bash_scripts
-```
-
-Basically, it will create `bash_scripts` directory if it doesn't exist already and then switch to that directory.
-
-Here. let's create a new script named `knock.sh` with the following text.
-
-```
-#!/bin/bash
-
-echo knock, knock
-echo "Who's there?"
-echo "It's me, $USER"
-```
-
-Change the file permission and run the script. You learned it in the previous chapter.
-
-Here's what it produced for me:
-
-![Using global variable in Bahs script][3]
-
-**Did you notice how it added my name to it automatically?** That's the magic of the global variable $USER that contains the username.
-
-You may also notice that I used the " sometimes with echo but not other times. That was deliberate. [Quotes in bash][4] have special meanings. They can be used to handle white spaces and other special characters. Let me show an example.
-
-### Handling spaces in variables
-
-Let's say you have to use a variable called `greetings` that has the value `hello and welcome`.
-
-If you try initializing the variable like this:
-
-```
-greetings=Hello and Welcome
-```
-
-You'll get an error like this:
-
-```
-Command 'and' not found, but can be installed with:
-sudo apt install and
-```
-
-This is why you need to use either single quotes or double quotes:
-
-```
-greetings="Hello and Welcome"
-```
-
-And now you can use this variable as you want.
-
-![Using spaces in variable names in bash][5]
-
-### Assign the command output to a variable
-
-Yes! You can store the output of a command in a variable and use them in your script. It's called command substitution.
-
-```
-var=$(command)
-```
-
-Here's an example:
-
-```
-[email protected]:~$ today=$(date +%D)
-[email protected]:~$ echo "Today's date is $today"
-Today's date is 06/19/23
-[email protected]:~$
-```
-
-![Command substitution in bash][6]
-
-The older syntax used backticks instead of $() for the command substitution. While it may still work, you should use the new, recommended notation.
-
-> 💡 Variables change the value unless you declare a 'constant' variable like this:`readonly pi=3.14`. In this case, the value of variable`pi`cannot be changed because it was declared`readlonly`.
-
-### 🏋️ Exercise time
-
-Time to practice what you learned. Here are some exercise to test your learning.
-
-**Exercise 1**: Write a bash script that prints your username, present working directory, home directory and default shell in the following format.
-
-```
-Hello, there
-My name is XYZ
-My current location is XYZ
-My home directory is XYZ
-My default shell is XYZ
-```
-
-**Hint**: Use global variables $USER, $PWD, $HOME and $SHELL.
-
-**Exercise 2:** Write a bash script that declares a variable named `price`. Use it to get the output in the following format:
-
-```
-Today's price is $X
-Tomorrow's price is $Y
-```
-
-Where X is the initial value of the variable `price` and it is doubled for tomorrow's prices.
-
-**Hint**: Use / to escape the special character $.
-
-The answers to the exercises can be discussed in this dedicated thread in the community.
-
-In the next chapter of the Bash Basics Series, you'll see how to make the bash scripts interactive by passing arguments and accepting user inputs.
-
---------------------------------------------------------------------------------
-
-via: https://itsfoss.com/bash-use-variables/
-
-作者：[Abhishek Prakash][a]
-选题：[lkxed][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://itsfoss.com/author/abhishek/
-[b]: https://github.com/lkxed/
-[1]: https://itsfoss.com/content/images/2023/06/Using-variables-in-shell.png
-[2]: https://itsfoss.com/content/images/2023/06/bash-variables-types.png
-[3]: https://itsfoss.com/content/images/2023/06/using-global-variable-bash-script.png
-[4]: https://linuxhandbook.com:443/quotes-in-bash/
-[5]: https://itsfoss.com/content/images/2023/06/using-spaces-in-bash-variable.png
-[6]: https://itsfoss.com/content/images/2023/06/command-substitue-bash-variable.png
diff --git a/translated/tech/20230619.1 ⭐️⭐️ Bash Basics Series 2 Using Variables in Bash.md b/translated/tech/20230619.1 ⭐️⭐️ Bash Basics Series 2 Using Variables in Bash.md
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index 0000000000..8d4962d9c6
--- /dev/null
+++ b/translated/tech/20230619.1 ⭐️⭐️ Bash Basics Series 2 Using Variables in Bash.md	
@@ -0,0 +1,183 @@
+[#]: subject: "Bash Basics Series #2: Using Variables in Bash"
+[#]: via: "https://itsfoss.com/bash-use-variables/"
+[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/"
+[#]: collector: "lkxed"
+[#]: translator: "geekpi"
+[#]: reviewer: " "
+[#]: publisher: " "
+[#]: url: " "
+
+Bash 基础知识系列 #2：在 Bash 中使用变量
+======
+
+在 Bash 基础知识系列的第一部分中，我简要提到了变量.现在是时候在本章中详细了解它们了。
+
+如果你曾经进行过任何类型的编码，你一定熟悉术语“变量”。
+
+如果没有，请将变量视为保存信息的盒子，并且该信息可以随着时间的推移而改变。
+
+让我们看看如何使用它们。
+
+### 在 Bash shell 中使用变量
+
+打开终端并使用随机数 4 初始化变量：
+
+```
+var=4
+```
+
+现在你有一个名为 `var` 的变量，它的值为 `4`.想验证一下吗？ **通过在变量名前添加 $ 来访问变量的值**.这称为参数扩展。
+
+```
+[abhishek@itsfoss]:~$ echo The value of var is $var
+The value of var is 4
+```
+
+> 🚧 变量初始化时 `=` 前后不能有空格。
+
+如果需要，你可以将该值更改为其他值：
+
+![Using variables in shell][1]
+
+在 Bash shell 中，变量可以是数字、字符或字符串（包括空格在内的字符）。
+
+![Different variable types in Bash shell][2]
+
+> 💡 与 Linux 中的其他事物一样，变量名称也区分大小写.它们可以由字母、数字和下划线 “\_” 组成。
+
+
+### 在 Bash 脚本中使用变量
+
+你是否注意到我没有运行 shell 脚本来显示变量示例？ 你可以直接在 shell 中做很多事情.当你关闭终端时，你创建的那些变量将不再存在。
+
+但是，你的发行版通常会添加全局变量，以便可以在所有脚本和 shell 中访问它们。
+
+让我们再写一些脚本.你应该之前创建了脚本目录，但无论哪种情况，此命令都会处理该目录：
+
+```
+mkdir -p bash_scripts && cd bash_scripts
+```
+
+基本上，如果 `bash_scripts` 目录尚不存在，它将创建它，然后切换到该目录。
+
+这里让我们使用以下文本创建一个名为 `knock.sh` 的新脚本。
+
+```
+#!/bin/bash
+
+echo knock, knock
+echo "Who's there?"
+echo "It's me, $USER"
+```
+
+更改文件权限并运行脚本.你在上一章中已经学到了。
+
+这是它为我生成的内容：
+
+![Using global variable in Bahs script][3]
+
+**你是否注意到它如何自动将我的名字添加到其中？** 这就是包含用户名的全局变量 $USER 的魔力。
+
+你可能还注意到，我有时将 " 与 echo 一起使用，但其他时候则不使用。这是故意的。[bash 中的引号][4] 有特殊含义。它们可用于处理空格和其他特殊字符。让我展示一个 例子。
+
+### 处理变量中的空格
+
+Let's say you have to use a variable called `greetings` that has the value `hello and welcome`.
+假设你必须使用一个名为 `greetings` 的变量，其值为 `hello and welcome`。
+
+如果你尝试像这样初始化变量：
+
+```
+greetings=Hello and Welcome
+```
+
+你会得到这样的错误：
+
+```
+Command 'and' not found, but can be installed with:
+sudo apt install and
+```
+
+这就是为什么你需要使用单引号或双引号：
+
+```
+greetings="Hello and Welcome"
+```
+
+现在你可以根据需要使用该变量。
+
+![Using spaces in variable names in bash][5]
+
+### 将命令输出分配给变量
+
+是的！ 你可以将命令的输出存储在变量中并在脚本中使用它们.这称为命令替换。
+
+```
+var=$(command)
+```
+
+这是一个例子：
+
+```
+[abhishek@itsfoss]:~$ today=$(date +%D)
+[abhishek@itsfoss]:~$ echo "Today's date is $today"
+Today's date is 06/19/23
+[abhishek@itsfoss]:~$
+```
+
+![Command substitution in bash][6]
+
+旧语法使用反引号而不是 $() 进行命令替换.虽然它可能仍然有效，但你应该使用新的推荐符号。
+
+> 💡 变量会更改值，除非你声明一个“常量”变量，如下所示：`readonly pi=3.14`.在这种情况下，变量 `pi` 的值无法更改，因为它被声明为 `readlonly`。
+
+### 🏋️ 练习时间
+
+是时候练习你所学到的东西了.这里有一些练习来测试你的学习情况。
+
+**练习 1**：编写一个 bash 脚本，以以下格式打印你的用户名、当前工作目录、主目录和默认 shell。
+
+```
+Hello, there
+My name is XYZ
+My current location is XYZ
+My home directory is XYZ
+My default shell is XYZ
+```
+
+**提示**：使用全局变量 $USER、$PWD、$HOME 和 $SHELL。
+
+**练习 2：** 编写一个 bash 脚本，声明一个名为 `price` 的变量.使用它来获取以下格式的输出：
+
+```
+Today's price is $X
+Tomorrow's price is $Y
+```
+
+其中 X 是变量 `price` 的初始值，并且明天价格翻倍。
+
+**提示**：使用 / 转义特殊字符 $。
+
+练习的答案可以在社区的这个专用帖子中讨论。
+
+在 Bash 基础知识系列的下一章中，你将了解如何通过传递参数和接受用户输入来使 bash 脚本具有交互性。
+
+--------------------------------------------------------------------------------
+
+via: https://itsfoss.com/bash-use-variables/
+
+作者：[Abhishek Prakash][a]
+选题：[lkxed][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://itsfoss.com/author/abhishek/
+[b]: https://github.com/lkxed/
+[1]: https://itsfoss.com/content/images/2023/06/Using-variables-in-shell.png
+[2]: https://itsfoss.com/content/images/2023/06/bash-variables-types.png
+[3]: https://itsfoss.com/content/images/2023/06/using-global-variable-bash-script.png
+[4]: https://linuxhandbook.com:443/quotes-in-bash/
+[5]: https://itsfoss.com/content/images/2023/06/using-spaces-in-bash-variable.png
+[6]: https://itsfoss.com/content/images/2023/06/command-substitue-bash-variable.png