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It is possible to use Planck directly on the command line, evaluating forms directly without entering a interactive REPL. To do this, pass -e or -​-​eval.

For example, here is a way to calculate π, based on a popular technique used in the early days with BASIC:

$ planck -e'(* 4 (Math/atan 1))'

It is also possible to use multiple evals. This prints a directory listing:

planck -e"(require 'planck.core)" -e'(run! (comp println :path) (planck.core/file-seq "/tmp"))'

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