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pi_tools/PiRTC/setup.sh

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#!/bin/sh
# check
sudo i2cdetect -y 1
# remove fake
sudo apt-get -y remove fake-hwclock
sudo update-rc.d -f fake-hwclock remove
sudo systemctl disable fake-hwclock
# device
cp hwclock-set /lib/udev/hwclock-set
# set
sudo hwclock -r
sudo hwclock -w
sudo hwclock -r