[R] how to delete all classes & variables in current & previously saved history?

[sagarnikam123]

i have variables stored in previous history,next time i log in,& load
previous history,i want to use same variable name for using other values,
& i don't know exactly how many are they ? & their names also..

How to delete all variable created in current & previous session i.e. (known
& unknown) which form up-to current state?

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