Flush output of child process

Question

I created a child process via IPC::Open2.
I need to read from the stdout of this child process line by line.
Problem is, as the stdout of the child process

Answer 1

Unfortunately Perl has no control over the buffering behavior of the programs it executes. Some systems have an unbuffer utility that can do this. If you have access to this tool, you could say

my $pid = open2($out, $in, 'unbuffer ./child_process');

There's a discussion here about the equivalent tools for Windows, but I couldn't say whether any of them are effective.