How to execute mongo commands through shell scripts?

Question

I want to execute mongo commands in the shell script, e.g. in a script test.sh:

#!/bin/sh 

mongo myDbName 

db.mycollection.findOne() 

show collections

When I execute this script via ./test.sh, then the connection to MongoDB is established, but the following commands are not executed.

How to execute other commands through shell script test.sh?

Answer 1

To execute mongo commands through shell scripts you can also evaluate a command using the --eval flag if it is just a single command.

mongo --eval "printjson(db.serverStatus())"

Answer 2

Simply put your mongo script into a .js file and execute 

mongo < yourFile.js

Example:

demo.js //file has your script

use sample  //db name

show collections

Now keep this file in "c:db-scripts"

Then in cmd prompt go to "c:db-scripts"

C:db-scripts>mongo < demo.js

The above syntax will execute the code in mongo and shows the output as: 

C:db-scripts>mongo < demo.js

Mongo shell version: 3.0.4

Connecting to: test

switched to db sample

users   //collection name

tasks   //collection name

bye

C:db-scripts>

Answer 3

We can execute the commands of mongodb using shell scripts to do this we have to use mongo shell and there directly we can pass the commands
Step-1 Go to Mongo shell
Step-2 Hit command

mongo --eval "db.adminCommand('listDatabases')"

With the help of the above command we will be connected to mongodb server on port number 27017 and finally we can execute our specified command.