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$ perl -le 'for (0..10) { print; sleep 1 }'
$ perl -le 'for (0..10) { print; sleep 1 }' | tee /tmp/foo
$ perl -le '$|=1; for (0..10) { print; sleep 1 }' | tee /tmp/foo

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#!/bin/bash
exec > >(tee "/tmp/foo")
perl -le '$|=1; for (0..10) { print; sleep 1 }'