https://www.slideshare.net/KeizoNagamine/uguirecttransform
git commit --allow-empty -m "initial commit"
https://www.1ft-seabass.jp/memo/2015/05/15/raspberry-pi-dhclient-refresh-wlan/
https://qiita.com/ikai/items/62e49385a1e3e7c953ad
https://qiita.com/kotauchisunsun/items/d0b0e0792939a53d558b
git clone でCould not resolve proxy: http
のときは, git config --global --unset http.proxy