Customize the Prompt

You may modify the content of the prompt by setting the variable prompt in the mongo shell. The promptvariable can hold strings as well as JavaScript code. If prompt holds a function that returns a string, mongo can display dynamic information in each prompt.

You can add the logic for the prompt in the .mongorc.js file to set the prompt each time you start up the mongo shell.

Customize Prompt to Display Number of Operations

For example,to create a mongo shell prompt with the number of operations issued in the current session, define the following variables in the mongo shell:

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

The prompt would then resemble the following:

1>
2>
3>

Customize Prompt to Display Database and Hostname

To create a mongo shell prompt in the form of <database>@<hostname>$, define the following variables:

3> prompt = "> "
> host = db.serverStatus().host;
huey
> prompt = function() {
... return db+"@"+host+"$ ";
... }
function () {
return db+"@"+host+"$ ";
}

The prompt would then resemble the following:

test@huey$ 

Customize Prompt to Display Up Time and Document Count

To create a mongo shell prompt that contains the system up time and the number of documents in the current database, define the following prompt variable in the mongo shell:

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

The prompt would then resemble the following:

Uptime:5897 Documents:6 >

Use an External Editor in the mongo Shell

You can use your own editor in the mongo shell by setting the EDITOR environment variable before starting the mongo shell.

export EDITOR=vim
mongo

Once in the mongo shell, you can edit with the specified editor by typing edit <variable> or edit <function>, as in the following example:

  1. Define a function myFunction:

    function myFunction () { }
  2. Edit the function using your editor:
    edit myFunction

    The command should open the vim edit session. When finished with the edits, save and exit vim edit session.

  3. In the mongo shell, type myFunction to see the function definition:
    myFunction

    The result should be the changes from your saved edit:

    function myFunction() {
    print("This was edited");
    }

NOTE: As mongo shell interprets code edited in an external editor, it may modify code in functions, depending on the JavaScript compiler. For mongo may convert 1+1 to 2 or remove comments. The actual changes affect only the appearance of the code and will vary based on the version of JavaScript used but will not affect the semantics of the code.

Change the mongo Shell Batch Size

The db.collection.find() method is the JavaScript method to retrieve documents from a collection. The db.collection.find() method returns a cursor to the results; however, in the mongo shell, if the returned cursor is not assigned to a variable using the var keyword, then the cursor is automatically iterated up to 20 times to print up to the first 20 documents that match the query. The mongo shell will prompt Type it to iterate another 20 times.

You can set the DBQuery.shellBatchSize attribute to change the number of documents from the default value of 20, as in the following example which sets it to 10:

DBQuery.shellBatchSize = 10;

MongoDB - The mongo Shell, Configure the mongo Shell的更多相关文章

  1. MongoDB的安装,mongod和mongo的区别

    一. mongoDB安装路径 安装路径(最新4.0.11):https://www.mongodb.com/download-center/community?jmp=nav 建议另外找路径下载,外网 ...

  2. MongoDB学习笔记:文档Crud Shell

    MongoDB学习笔记:文档Crud Shell   文档插入 一.插入语法 db.collection.insertOne() 将单个文档插入到集合中.db.collection.insertMan ...

  3. 1.Configure the mongo Shell-官方文档摘录

    Customize the Prompt 自定义提示 You may modify the content of the prompt by setting the variable prompt i ...

  4. MONGODB(三)——Java操作Mongo

    相比于java调用MySqlApI来操作数据库,调用Mongo要简洁容易的多.通过一个简单的样例,很容易地就可以上手 一.导入Jar包 添加Monog支持Java的jar包,这里使用的是2.9.3 & ...

  5. 交互式shell和非交互式shell、登录shell和非登录shell的区别

    交互式shell和非交互式shell.登录shell和非登录shell的区别.首先,这是两个不同的维度来划分的,一个是是否交互式,另一个是是否登录. 交互式shell和非交互式shell(intera ...

  6. linux中的shell脚本编程---初识shell

    Shell是用户与Linux或Unix内核通信的工具,shell编程指的并不是编写这个工具,而是指利用现有的shell工具进行编程,写出来的程序是轻量级的脚本,我们叫做shell脚本. Shell的语 ...

  7. Ubuntu下把缺省的dash shell修改为bash shell

    Ubuntu下缺省使用的是shell是dash,而不是bash.从/bin/sh软连接的指向可以看出这点. dash shell 虽然比bash shell更轻便,但是它并不支持所有的语法,运行she ...

  8. Shell编程-11-子Shell和Shell嵌套

    目录 什么是子Shell 子Shell产生的途径 Shell脚本调用模式 什么是子Shell     子Shell的概念其实是贯穿整个Shell的,如果想要更好的理解和写Shell脚本则必须要了解子S ...

  9. [shell]shell 中| && || () {} 用法以及shell的逻辑与或非

    转自:https://www.jianshu.com/p/617c1ee1e46e | 运算符 管道符号,是unix一个很强大的功能,符号为一条竖线:"|".用法: command ...

随机推荐

  1. 面向过程MySQL数据库链接操作

    刚好今天复习到这个章节,将就发布出来,就当是为自己复习了 //链接数据库 $link = mysqli_connect('localhost/IP地址','用户名','密码','数据库名'); //设 ...

  2. flex中DataGrid里使用itemRenderer后数据无法绑定到数据源的问题

    <?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="ht ...

  3. Windows Message Codes

    https://www.autoitscript.com/autoit3/docs/appendix/WinMsgCodes.htm WM_ACTIVATE 0x0006 WM_ACTIVATEAPP ...

  4. MySQL中你肯定不知道的int隐情

    MySQL中定义id字段为int类型,但是你知道它内部是什么玩意吗? 1.如果定义int类型,但是不声明长度,系统默认为11个长度(这个大家都知道): 2.如果指定长度小于11,实际上系统还是默认为1 ...

  5. Ruby Scripting - Array

    A literal array is created by putting squarebrackets around a comma-separated list of elements eg: # ...

  6. Codeforces Round #260 (Div. 1) D. Serega and Fun 分块

    D. Serega and Fun Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/455/pro ...

  7. (转)用AGG实现高质量图形输出(一)

    AGG是一个开源.高效的跨平台2D图形库.AGG的功能与GDI+的功能非常类似,但提供了比GDI+更灵活的编程接口,其产生的图形的质量也非常高(自称超过GDI+) 使用前AGG的准备工作 下载AGG库 ...

  8. iOS和android游戏纹理优化和内存优化(cocos2d-x)

    1.2d游戏最占内存的无疑是图片资源. 2.cocos2d-x不同平台读取纹理的机制不同.ios下面使用 CGImage,android和windows下是直接调用png库.我测试了下,使用png库直 ...

  9. CPU 100%

    http://www.cnblogs.com/xuehong1985/articles/757060.html

  10. Linux 下configure 参数配置与软件的安装与卸载

    Linux环境下的软件安装,并不是一件容易的事情:如果通过源代码编译后在安装,当然事情就更为复杂一些:现在安装各种软件的教程都非常普遍:但万变不离其中,对基础知识的扎实掌握,安装各种软件的问题就迎刃而 ...