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The homebrew tap originally shipped only the macOS binary, so on Linux you got exec format error. The maintainer fixed the formula in 0.2.1 to install a portable Java-based build on Linux instead: run brew upgrade datastax/astra-cli/astra-cli to pick up the fixed version. Source: https://github.com/datastax/astra-cli/issues/28
Source: https://github.com/datastax/astra-cli/issues/28