MongoDB: How to update multiple documents with a single command?

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Multi update was added recently, so is only available in the development releases (1.1.3). From the shell you do a multi update by passing true as the fourth argument to update(), where the the third argument is the upsert argument:

db.test.update({foo: "bar"}, {$set: {test: "success!"}}, false, true);

For versions of mongodb 2.2+ you need to set option multi true to update multiple documents at once.

db.test.update({foo: "bar"}, {$set: {test: "success!"}}, {multi: true})

For versions of mongodb 3.2+ you can also use new method updateMany() to update multiple documents at once, without the need of separate multi option.

db.test.updateMany({foo: "bar"}, {$set: {test: "success!"}})

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