Как отлаживать консольные приложения?
As with Delphi you can use Kylix to write console applications even though many
people think that's not important. ;-)
When you start a console program in the Delphi Debugger it automatically opens
a console window ("DOS command prompt") where you can see the output of e.g.
the writeln command.
Kylix doesn't do that automatically and if you don't look hard enough you might
think it is impossible to debug console applications with it.
But if you open the run / parameters dialog you will find an entry called
"Use Launcher Application" that is prefilled with xconsole. Just tick this
option and there you go.
Взято с сайта https://www.swissdelphicenter.ch/en/tipsindex.php