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Actually, the dart upgrade command has been deprecated in favor of dart sdk upgrade for updating the Dart SDK itself.
Here's a breakdown:
Updating Dart SDK:
Use dart sdk upgrade to check for and install updates to the Dart SDK.
dart upgrade:
This command was previously used for upgrading Dart packages, but it's no longer recommended for the SDK itself.
Here's why they changed it:
dart pub upgrade used to be the command, but it has been simplified to dart upgrade for brevity.
However, dart upgrade can now be confused with upgrading just the Dart packages within a project, rather than the entire Dart SDK.
To avoid confusion, they recommend using the more specific dart sdk upgrade for the SDK itself.