Clearing Console; of weeks of codes!

Dear All:

I do see I have weeks of codes in my console when I check with my arrow up
keys.  I have been clearing them with Control L but it seems to clear it
clear the screen temporally. I do see the previous codes again when I open R
the next day, after quitting the session! 

Q:
How do I clear this?


Thanks;

YA 

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