Want to delete the history of used commands stored!!!

Need to start the history of used commands fresh. So i need to delete the old history. When i checked the fc command there is no option to delete the history. How can i do this?
can this be done by:
set history=0
to delete and again set this to higher number to start the history fresh!

after a little research i could do what i need.
setting the history to zero.
$HISTSIZE=0;export HISTSIZE
this would permanently delete the history and does not store any commands in the history.
to invoke again:
$HISTSIZE=100;export HISTSIZE
Hope this would help others in the community.

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