1.ubuntu-18.04.md

• https://www.zdnet.com/article/how-to-upgrade-from-ubuntu-linux-16-04-to-18-04/

apt update
apt upgrade
apt dist-upgrade
apt autoremove
do-release-upgrade
# +00:01 [RETURN]
# +00:04 y
# +00:16 (keyboard)
# +00:23 (ssh package)
# +00:27 y
# +00:30 reboot
apt remove nano
update-alternatives --config editor  # /usr/bin/vim.basic

2.motd.md

• disable all

chmod -x /etc/update-motd.d/*

• show information of package and reboot

chmod +x /etc/update-motd.d/90-updates-available
chmod +x /etc/update-motd.d/98-reboot-required

pretty disk usage

apt install dbar
vi /etc/update-motd.d/50-df
chmod +x /etc/update-motd.d/50-df

• /etc/update-motd.d/50-df

#!/usr/bin/env bash
# show disk usages with colorized progress bar by 'dbar'

echo "Filesystem"
for x in / /data; do \
  df -h $x | grep -oP '(\d+)%' | cut -d'%' -f1 | dbar -nonl | sed -e "s/\\([\\=]\\+\\)/\x1B\[1;32m\\1\x1B\[0m/";\
  df -h --output=size,target $x | sed 1d;\
done

$ ssh ubuntu1
Filesystem
  8% [==                       ]  29G /
 51% [=============            ] 4.9T /data
Last login: Fri Sep 28 16:08:11 2018 from 10.10.15.51