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Customize the mongosh Prompt自定义mongosh提示

By default the mongosh prompt includes the current database name. You can modify the prompt variable to display custom strings or to return dynamic information about your mongosh session.默认情况下，mongosh提示符包含当前数据库名称。您可以修改prompt变量以显示自定义字符串或返回有关mongosh会话的动态信息。

Custom prompts are not stored when you exit mongosh. To have a custom prompt persist through restarts, add the code for your custom prompt to .mongoshrc.js.退出mongosh时不会存储自定义提示。要使自定义提示在重新启动时保持不变，请将自定义提示的代码添加到.mongoshrc.js中。

Display Line Numbers显示行号

To display line numbers in the mongosh prompt, run the following code inside mongosh:要在mongosh提示符中显示行号，请在mongosh中运行以下代码：

let cmdCount = 1;
prompt = function() {
             return (cmdCount++) + "> ";
         }

The prompt will look like this:提示如下：

1> show collections
2> use test
3>

Display Database and Hostname显示数据库和主机名

The current database name is part of the default mongosh prompt. To reformat the prompt to show the database and hostname, use a function like this one:当前数据库名称是默认mongosh提示符的一部分。要重新格式化提示以显示数据库和主机名，请使用以下函数：

{
   const hostnameSymbol = Symbol('hostname');
   prompt = () => {
      if (!db[hostnameSymbol])
         db[hostnameSymbol] = db.serverStatus().host;
      return `${db.getName()}@${db[hostnameSymbol]}> `;
   };
}

The prompt will look like this:提示如下：

admin@centos0722:27502>

Display System Up Time and Document Count显示系统正常运行时间和文档计数

To create a prompt that shows the system uptime and a count of documents across all collections in the current database, use a function like this one:要创建显示当前数据库中所有集合的系统正常运行时间和文档计数的提示，请使用以下函数：

prompt = function() {
   return "Uptime:" + db.serverStatus().uptime +
          " Documents:" + db.stats().objects +
          " > ";
   }