A bash script to export all MongoDB collections from a single database to JSON files

export.sh

#!/bin/bash

if [ ! $1 ]; then
    echo " Example of use: $0 database_name [dir_to_store]"
    exit 1
fi
db=$1
out_dir=$2
if [ ! $out_dir ]; then
    out_dir="./"
else
    mkdir -p $out_dir
fi

collections=`mongo --eval "print(db.getCollectionNames())" --quiet $db`
for c in ${collections//,/ }
do
    echo "==> Exporting collection: '$c'"
    mongoexport -d $db -c $c -o "$out_dir/${db}_${c}.json"
done