How do I handle command-line arguments in a mongo script?

Question

I've been working on some simple scripts to run on mongo from the bash command-line. Originally, I ran them as follows:

$ mongo dbname script.js

but I recently came across mikemaccana's answer, https://stackoverflow.com/a/23909051/2846766, indicating the use of mongo as an interpreter so I can just execute script.js (or any name I choose, with or without the .js) from the command line.

$ script.js

I think it's brilliant and clean, but now I'd like to pass in a database name as a command line argument.

$ script.js dbname

Here I use the bash-style "$1" to demonstrate what I'm doing in script.js.

#!/usr/bin/env mongo
var db = new Mongo().getDB($1);
// Do other things with db, once I resolve the name from the command line.

This results in a "ReferenceError: $1 is not defined ...", which is not surprising. But how would I reference command line arguments? Is this going to be a mongo convention? a javascript convention? Is it possible? It would make my command-line experience with mongo much better aesthetically.

RScottCarson · Accepted Answer · 2014-07-01 23:35:17Z

2

Currently there is no way to do this using the mongo shell...

https://groups.google.com/forum/#!topic/mongodb-user/-pO7Cec6Sjc

... try using a bash script (or other scripting language you are comfortable with) if you want to get a similar command line experience.

answered Jul 1, 2014 at 23:35

RScottCarson

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Community · Accepted Answer · 2017-05-23 12:02:42Z

2

Duplicate of How to pass argument to Mongo Script In a nutshell, this is not possible but several workarounds are given in the answers (not repeated here).

edited May 23, 2017 at 12:02

CommunityBot

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answered Mar 14, 2016 at 14:12

Florian

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Ron · Accepted Answer · 2021-11-11 01:05:39Z

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You can pass args to your script through

mongo --eval 'var databasePassword="password"' script.js

and you can access databasePassword value inside script.js

db.auth({ user: 'testUser, pwd: databasePassword });

answered Nov 11, 2021 at 1:05

Ron

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