命令在脚本中失败，在命令行中有效

Question

I have a simple script to get an export from MongoDB:

#!/bin/sh -x

QUERY="'{ \"type\":\"listing\" }'"

mongoexport --db event --collection listing --query $QUERY --fields type,name --csv

(I'm using the -x switch for debugging purposes)

Here's the output when I run the script:

$ ./simple_query.sh 
+ QUERY='{ "type":"listing" }'
+ mongoexport --db event --collection listing --query '{ "type":"listing" }' --fields type,name --csv
ERROR: too many positional options

However, if I merely copy and paste the mongoexport line to the prompt, it works! What's going on?

(Using MongoDB 2.0.0)

Answer 1

Are you using older version of mongodb? If so maybe it's this bug. It is fixed on 2.0.0-* versions.

Edit : Actually this might be different problem. You can fix it by removing the spaces on the query. Spaces seem to make the shell think it is actually multiple arguments:

QUERY="'{\"type\":\"listing\"}'"