I use Termux and GNU nano to edit program text but I don't know how to save it from Nano. Normally in Nano I press shift + O but with Android (I use Samsung S8) the ctrl + O instead prints the char O.
How should I save and exit Nano?
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You can exit by using (ctrl + o) not (shift + o)
Tip. In termux use vim instead. not because of "text editor wars" but it is painful to send ctrl and shift keys even with modified keyboards similar to hacker's keyboard