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For deleting a previously created file, I don’t think q has an keyword/operator for that. However you can use the system keyword to execute a system command (see more here – (system keyword executes a system command | Reference | kdb+ and q documentation – Kdb+ and q documentation (kx.com))
So for your example of deleting a file here’s a quick example. In the first line I’m writing some text to a file test.txt in a directory test and the following line I use a system command to delete it
q)`:test/test.txt 0: enlist "text to save" `:test/test.txt q)system"del test\test.txt"