... or in a new window.

If you want a separate window for the output, you can always start a new terminal emulator, and have it run a command via its -e option (-e applies to many terminals, in case of doubt, check the man page). For example

system qw(xterm -e find / -type d);
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(xterm options (such as geometry, font size, etc.) would go before the -e)

As soon as the command has finished, the terminal will automatically close.