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pi_tools/Projects/PiRTC/setup.sh

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