How to execute mongo commands from bash?

Question

I am trying to run this command from bash script:

 mongo 192.168.10.20:27000 --eval \"use admin && db.shutdownServer() && quit()\"

Answer 1

From the mongo docs:

--eval option

Use the --eval option to mongo to pass the shell a JavaScript fragment, as in the following: mongo test --eval "printjson(db.getCollectionNames())"

You can also put your JS Fragments into a .js file then do:

mongo < myScript.js

You may also find more useful stuff in this SO question

Answer 2

There are differences between interactive & scripted mongo shell sessions. In particular, commands like use admin are not valid JavaScript and will only work in an interactive shell session.

The working equivalent of your shutdown command line would be:

mongo 192.168.10.20:27000/admin --eval "db.shutdownServer()"

You can include the database to use in the connection string, and there is no need to quit from a scripted mongo shell session.

If you do need to change databases from a scripted session, there is a db.getSiblingDB() JavaScript function. An alternative way to write the shutdown command above would be:

 mongo 192.168.10.20:27000 --eval "db=db.getSiblingDB('admin');db.shutdownServer()"

Answer 3

You can use heredoc syntax.

#! /bin/sh
mongo <<EOF
use admin
db.shutdownServer()
quit()
exit

Turns out heredoc syntax throws a warning when EOF is missing at the end for bash script. This is the bash script version.

#! /bin/bash
mongo <<EOF
use admin
db.shutdownServer()
quit()
EOF

Here is the output, I guess this is what you expected.

MongoDB shell version: 2.4.14
connecting to: test
switched to db admin
Wed Jun 24 17:07:23.808 DBClientCursor::init call() failed
server should be down...
Wed Jun 24 17:07:23.810 trying reconnect to 127.0.0.1:27017
Wed Jun 24 17:07:23.810 reconnect 127.0.0.1:27017 ok
Wed Jun 24 17:07:23.812 Socket recv() errno:104 Connection reset by peer 127.0.0.1:27017
Wed Jun 24 17:07:23.812 SocketException: remote: 127.0.0.1:27017 error: 9001 socket exception [RECV_ERROR] server [127.0.0.1:27017] 
Wed Jun 24 17:07:23.812 DBClientCursor::init call() failed