Problem
When you try to use nano not as root user, this message pops up:
.nano_history: Permission denied
You can acknowledge it and move on. However, it is annoying.
Solution
sudo nano /etc/nanorc
Find the lines below and put a hash mark (#) in from of line “set historylog”. This should solve the problem.
## Enable ~/.nano_history for saving and reading search/replace strings.
#set historylog