ExternalEvaluate likes to print whatever hits stdout or stderr in the course of evaluation. For example,

In[1]= ExternalEvaluate["Shell", "echo 'hi!'"]
Out[1]= Success[...]

I'd like to suppress this printed output and just extract the stdout from the actual output. How can I do that?

I would have hoped there would be an analogue of e.g. QuietEcho or an option for ExternalEvaluate that controls this, but I couldn't find either.

I'm guessing it will involve finding a way to intercept $Output somehow?

  • 2
    $\begingroup$ Have you trie Block[{Print}, code]? $\endgroup$
    – Jason B.
    Jan 12 at 1:01
  • $\begingroup$ @JasonB. Oh, yup, that did it! I guess I didn't expect Print to be used internally! $\endgroup$
    – thorimur
    Jan 12 at 2:09

1 Answer 1


ExternalEvaluate will attempt to route any external print-like output directly to Print. To disable this you can just Block that symbol during evaluation:

In[2]:= Block[{Print},
 ExternalEvaluate["Shell", "echo 'hi!'"]

Out[2]= Success["ExecutionCompleted", <|...|>]

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