How can I print text immediately without waiting for a newline in Perl?

Question

I have a computationally expensive task in perl, and would like to inform the user that computation is ongoing by printing out a period after each portion of the computation is

Answer 1

set $|=1 before you start printing. Eg.

perl -e ' $|=1; foreach (1..10) { print "$_ "; sleep(1); }'