查询

示例1：
echo "var versions = db.version(); print(\"version is \" + versions);" > 4.js
mongo -u root -p pass --authenticationDatabase admin  core 4.js示例2：
echo "var versions = db.version(); print(\"version is \" + versions); var collections = db.getCollectionNames(); collections.forEach(function (collection) {
print(\"collection=\" + collection);
});" > 4.js
mongo -u root -p pass  --authenticationDatabase admin  core 4.js示例3：
echo "var versions = db.version(); print(\"version is \" + versions); var collections = db.getCollectionNames(); collections.forEach(function (collection) {
var stats = db[collection].stats();
print(\"collection=\" + collection + \", sotorageSize=\" + stats.storageSize );
});" > 4.js
mongo -u root -p pass  --authenticationDatabase admin  core 4.js