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Come posso elencare tutte le raccolte nella shell MongoDB?

Puoi fare...

JavaScript (shell):

db.getCollectionNames()

Node.js:

db.listCollections()

Non JavaScript (solo shell):

show collections

Il motivo per cui lo chiamo non JavaScript è perché:

$ mongo prodmongo/app --eval "show collections"
MongoDB shell version: 3.2.10
connecting to: prodmongo/app
2016-10-26T19:34:34.886-0400 E QUERY    [thread1] SyntaxError: missing ; before statement @(shell eval):1:5

$ mongo prodmongo/app --eval "db.getCollectionNames()"
MongoDB shell version: 3.2.10
connecting to: prodmongo/app
[
    "Profiles",
    "Unit_Info"
]

Se vuoi davvero quel dolce, dolce show collections output, puoi:

$ mongo prodmongo/app --eval "db.getCollectionNames().join('\n')"
MongoDB shell version: 3.2.10
connecting to: prodmongo/app
Profiles
Unit_Info