Shell script to easily export mongo collections into JSON files

batch_export.sh

#!/usr/bin/env bash

#https://gist.github.com/EyalAr/67791f51fce51ed55594

COLLECTIONS=()
HOST="127.0.0.1"
PORT="27017"
DB=

if [ -n "$1" -a "$1" = "--help" ]
then
    echo "Usage: $0 -h hostname -p port - d database -c collection"
    echo
    echo "  hostname    Address of the mongo server. Defaults to 127.0.0.1"
    echo "  port        Port of the mongo server. Defaults to 27017"
    echo "  database    Name of the database."
    echo "  collection  Name of collection to backup."
    echo 
    echo "Option -c may be specified multiple times for multiple collections."
    echo
    echo "JSON files will be created in the current directory,"
    echo "One for each collection."
    echo
    echo "Example: $0 -h 192.168.1.154 -d dev -c products -c prices -c companies"
    exit
fi

while getopts "h:p:d:c:" flag
do
    case $flag in
        h) HOST="$OPTARG" ;;
        p) PORT="$OPTARG" ;;
        d) DB="$OPTARG" ;;
        c) COLLECTIONS+=("$OPTARG") ;;
    esac
done

if [ -z "$HOST" ]
then
    echo "Please specify a host (-h). Type '$0 --help' for help."
    exit
fi

if [ -z "$PORT" ]
then
    echo "Please specify a port (-p). Type '$0 --help' for help."
    exit
fi

if [ -z "$DB" ]
then
    echo "Please specify a database (-d). Type '$0 --help' for help."
    exit
fi

if [ -z "$COLLECTIONS" ]
then
    echo "Please specify at least one collection to export (-c)."
    echo "Type '$0 --help' for help."
    exit
fi

for c in ${COLLECTIONS[@]}
do
    echo "Exporting $HOST:$PORT/$DB/$c to $c.json..."
    mongoexport --host $HOST --port $PORT --db $DB --collection $c > $c.json
done

echo "Done."