Bash and MongoDB: Whitespaces in Eval not working

Question

In a bash script, this won't work with Unexpected token ILLEGAL

#!/bin/bash
value="White Spaced String"
mongo --verbose localhost:27017/myDB --eval 'db.ips.update({"id":"id"}, { $push: { "key": {"key":"'$value'"}}})'

where as this works:

#!/bin/bash
value="NonWhiteSpacedString"
mongo --verbose localhost:27017/myDB --eval 'db.ips.update({"id":"id"}, { $push: { "key": {"key":"'$value'"}}})'

Any ideas ow to work around this? I tried:

value="${value// /\\ }" which will substitute whitespaces with \ escape signs and a whitespace. Yet, no success.

This does work, yet I want to preserve the whitespaces in my JSON in Mongo:

value="${value// /_}"

Your escapig is no working, you have " which appear to not be escaping right — Sammaye
– Sammaye, Commented Jan 21, 2015 at 14:21

rici · Accepted Answer · 2015-01-21 15:26:24Z

1

The argument to the --eval option needs to be a single bash word, so you need to avoid bash word-expanding $value. That means you need to put the expansion inside double-quotes:

mongo --verbose localhost:27017/myDB --eval \
  'db.ips.update({"id":"id"}, { $push: { "key": {"key":"'"$value"'"}}})'
                                                         ^      ^

That argument consists of a single-quoted segment, a double-quoted segment, and then a final single-quoted segment. The double quotes inside the single-quoted segments are, of course, ordinary characters.

answered Jan 21, 2015 at 15:26

rici

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