[Lazarus] Where to find the output/input messages in MacOS/Linux?

[Kelvin Jiao]

Hi all,
I'm new to Lazarus and use it on MacOS and Linux. I tried to compile a 
simple console program and debug/run it (like writeln and readln), but I 
can not find the output/input in the Messages window. In windows 
edition, there will be a pop-up external console. However, it doesn't 
exist in MacOS and Linux, where and how can I check the output/input? 
Thanks a lot.
Best regards,
Kelvin

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