How to write Shell Script for Mongo Find query.?

Question

I am new to shell scripting. Actually I am writing a shell script for mongo to find specific document, this shell script accepts an argument and uses in find. I had written a simple find query:

mongo poc --eval "printjson(db.users.find().toArray())"

That's working fine, but now problem is that when I want to find specific document by passing users id that gives null records, so here is my shell script:

mongo poc --eval "printjson(db.users.find({"userid":"$1"}).toArray())"

I don't know what is wrong, please help so that i would be able to write for update and remove query as well.

Stennie · Accepted Answer · 2016-07-13 12:18:28Z

4

The issue is that you are trying to use double quotes inside a quoted string in your Bash script.

You should either:

Use single quotes:

#!/bin/bash

mongo poc --eval "printjson(db.users.find({'userid':'$1'}).toArray())"

Escape the double quotes inside the string:

#!/bin/bash

mongo poc --eval "printjson(db.users.find({\"userid\":\"$1\"}).toArray())"

For more details, see: Bash quotes and escaping.

answered Jul 13, 2016 at 12:18

Stennie

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