#!/bin/bash
perl -E 'say {*STDOUT} "hi"; say {*STDERR} "bye"' \
> >(sed s/^/out:/) \
2> >(sed s/^/err:/ >&2)
IyEvYmluL2Jhc2gKcGVybCAtRSAnc2F5IHsqU1RET1VUfSAiaGkiOyBzYXkgeypTVERFUlJ9ICJieWUiJyBcCiAgICAgICAgPiA+KHNlZCBzL14vb3V0Oi8pICAgICAgICAgICAgICAgICAgICAgICAgICBcCiAgICAgICAyPiA+KHNlZCBzL14vZXJyOi8gPiYyKQo=