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It's interesting they banned the "echo" command but then use it in the tests [0].

0 - https://github.com/asdf-vm/asdf/blob/master/test/banned_comm...

Banned is a bad term, these commands are non-portable or unpredictable and therefore not allowed in asdf scripts. Tests are totally different and might be constrained to run on specific platforms where you can and should use all the platform features to better run tests.

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