Linux中.bashrc文件是什么？

The .bashrc file is a script file that’s executed when a user logs in. The file itself contains a series of configurations for the terminal session. This includes setting up or enabling: coloring, completion, shell history, command aliases, and more.

.bashrc文件是用户登录时执行的脚本文件。该文件本身包含终端会话的一系列配置。 这包括设置或启用：着色，完成，shell历史记录，命令别名等。

It is a hidden file and simple ls command won’t show the file.

这是一个隐藏文件 ，简单的ls命令不会显示该文件。

To view hidden files, you can run the below command:

要查看隐藏的文件，可以运行以下命令：

$ ls -a

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You can see the .bashrc command in the first column. The contents of .bashrc can be changed to define functions, command aliases, and customize the bash.

您可以在第一列中看到**.bashrc命令。 可以更改.bashrc**的内容以定义函数，命令别名和自定义bash。

.bashrc file has a lot of comments that makes it easy to understand.

.bashrc文件包含很多注释，使它易于理解。

To view the bashrc file:

要查看bashrc文件：

$ cat .bashrc

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A few examples of editing .bashrc are provided below.

下面提供了一些编辑.bashrc的示例。

在bashrc中定义函数 (Defining functions in bashrc)

bashrc can be used to define functions that reduce redundant efforts. These functions can be a collection of basic commands. These functions can even use arguments from the terminal.

bashrc可用于定义减少冗余工作的功能。 这些功能可以是基本命令的集合。 这些函数甚至可以使用终端中的参数。

Let’s define a function that tells the date in a more descriptive manner.

让我们定义一个以更具描述性的方式告诉日期的函数。

First you’ll need to enter the .bashrc file in editing mode.

首先，您需要在编辑模式下输入.bashrc文件。

$ vi .bashrc

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Bashrc FileBashrc文件

This is what the terminal will look like. To start editing press any letter on the keyboard. At the end of the file add the following code:

这就是终端的外观。 要开始编辑，请按键盘上的任意字母。 在文件末尾添加以下代码：

today()
{
    echo This is a `date +"%A %d in %B of %Y (%r)"` return
}

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Press escape. Then to save and exit from vi, press colon (