#!/bin/bash
db=<db>
collection_list="<collection1> <collection2> <collection3>"
host=127.0.0.1
port=<port>

out_prefix=/Temp
for collection in $collection_list; do
	echo $collection
  	out_dir="${out_prefix}/${db}_${collection}/"
	mkdir -p ${out_dir}
  	mongodump --host $host --port $port --collection $collection --db $db --out ${out_dir}
done