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by Flenser 4375 days ago

   history -a  # append history lines from this session to the history file.
   
   #History file may contain history from other terminals not in this one so:

   history -c # clear [in-memory] history list deleting all of the entries.
   history -r # read the history file and append the contents to the history list instead.
I've heard that -n can be problematic which is why -c then -r is used.