in reply to Problem running code until a user hits a key

As the POD says, when you use ReadKey with 0 or higher, it does the equivalent of getc(3) which is buffered. You need to use non-buffered mode to do what you want. (Also when your program exits, you need to put the terminal back the way it was. I use an END block to allow for abnormal termination.)

Try this:

#!/usr/bin/perl use strict; use warnings; use diagnostics; use Term::ReadKey; my $count = 0; my $char = undef; ReadMode('cbreak'); while (!defined $char) { $char = ReadKey(-1); $count++; } print "$count\n"; # Put the terminal back the way you found it. END { ReadMode('restore'); }