To operate on all databases from MongoDB shell, you can use listDatabases along with adminCommand().
Let’s say we are using a sample database “test”. At first, check the current database with the help of db command.
Following is the query to get the current database
> db;
This will produce the following output
Test
Following is the query to operate on all the databases from the Mongo shell
> var allDatabaseList = db.adminCommand('listDatabases');
Now you need to use printjson() in order to print all databases. Following is the query
> printjson (allDatabaseList);
This will produce the following output
{ "databases" : [ { "name" : "admin", "sizeOnDisk" : 495616, "empty" : false }, { "name" : "config", "sizeOnDisk" : 98304, "empty" : false }, { "name" : "local", "sizeOnDisk" : 73728, "empty" : false }, { "name" : "sample", "sizeOnDisk" : 1388544, "empty" : false }, { "name" : "sampleDemo", "sizeOnDisk" : 278528, "empty" : false }, { "name" : "studentSearch", "sizeOnDisk" : 262144, "empty" : false }, { "name" : "test", "sizeOnDisk" : 9695232, "empty" : false } ], "totalSize" : 12292096, "ok" : 1 }