Peeking into processes that are still running

[yakir12]

How can I read the output of a process that hasn't (and never will) exit/end?

Consider the following example:

using OutputCollectors

script = raw"""
declare -i i=0
while TRUE
do
    i+=1
    echo "Line #$i"
    sleep 1
done
"""

oc = OutputCollector(`sh -c $script`)

Unsurprisingly, running tail(oc) for instance will never return.

Is there any way to retrieve the output "up to now"?