Changing Private Key Passphrase
If you ever need to change your private key passphrase, you can do so with this command:
ssh-keygen -f ~/.ssh/id_rsa -p
Enter your old passphrase and then enter a new passphrase.
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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