Find the default port number of a given service in Linux
To find the default port number of a given service in Linux:
$ grep <port> /etc/services
For example, to find the default port of a SSH service, simply run:
$ grep ssh /etc/services
MongoDB stores documents in collections
Collections are analogous to tables in relational databases. If a collection does not exist, MongoDB creates the collection when you first store data for that collection.
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