====== nspawn ======

create Arch Linux container:

  wget https://mirror.rackspace.com/archlinux/iso/latest/archlinux-bootstrap-x86_64.tar.zst
  #setup pacman:
  pacman-key --init
  pacman-key --populate
  #enable container:
  systemctl enable systemd-nspawn@arch
  
create Debian container:

  debootstrap --include=dbus,libpam-systemd stable /var/lib/machines/debian [mirror]
  #modify password
  chroot /var/lib/machines/debian
  passwd
  
  

====== virt-manager ======

enable Debian guest serial console:

  systemctl enable --now serial-getty@ttyS0.service


====== Wine ======

enable CJK fonts:

ch_font.reg:

<code>
REGEDIT4
 
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\FontLink\SystemLink]
"Lucida Sans Unicode"="PingFang.ttc"
"Microsoft Sans Serif"="PingFang.ttc"
"MS Sans Serif"="PingFang.ttc"
"Tahoma"="PingFang.ttc"
"Tahoma Bold"="PingFang.ttc"
"SimSun"="PingFang.ttc"
"Arial"="PingFang.ttc"
"Arial Black"="PingFang.ttc"
</code>

====== Arch Linux ======

===== makepkg =====

Download PKGBUILD of a package:

  asp export pkg-name

install dependency and extract its source code:

  makepkg -so

create package of modified source code:

  makepkg -ei

====== KDE tweaks ======

Workaround for generic wayland icons for GTK apps showed in taskbar on KDE 6 wayland session:

  #from: https://discussion.fedoraproject.org/t/whats-with-the-wayland-icons-and-associated-apathy/40180/5
  
  Open the app you are wanting to fix (Vivaldi, Firefox Nightly, HandBrake, etc.)
  Add new kwin rule with Alt+F3 → More Actions → Configure Special Application Settings → Add Property → Desktop file name →
  Enter the desktop file name without extension (e.g. chromium-browser.desktop, fr.handbrake.ghb.desktop, vivaldi-stable.desktop, etc.)
  If you are using standard package, check name in “/usr/share/applications/”
  if you are using flatpak package, check name in “var/lib/flatpak/exports/share/applications/”


Scroll slow in KDE apps:

  #https://forum.manjaro.org/t/kde-dashboard-scrolls-very-slowly/10050
  #https://plus.google.com/+Micha%C5%82VonFlyneeofficial/posts/4pc5pUtMkRw
  pacman -Rdd xf86-input-libinput

Desktop disable cursor bouncing while launch new application:

  System Settings -> Applications -> Launch Feedback
  
Desktop double click to start application:

  System Settings -> Input Devices -> Mouse

disable transparent while dragging windows:

  System Settings -> Desktop Effects -> Translucency
  
window switcher(Alt+Tab) style:

  System Settings -> Task Switcher -> Visualization -> Thumbnail Grid
  
alt + left click to resize window:

  System Settings -> Window Behavior -> Window Actions
  
gnome-terminal full screen workaround:

  https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/880734
  
meta key start Application Launcher(KDE Plasma 5.11.5):

  https://askubuntu.com/a/961407
 
====== Fcitx ======

<code>
fcitx
fcitx-configtool
fcitx-gtk2
fcitx-gtk3
fcitx-libpinyin
fcitx-qt4
fcitx-qt5
fcitx-sogoupinyin
fcitx5-git
</code>

for SDDM, LightDM, `cat > ~/.xprofile`:

<code>
 export GTK_IM_MODULE=fcitx
 export QT_IM_MODULE=fcitx
 export XMODIFIERS=@im=fcitx
</code>
====== Debian ======

no-cloud images:
  
  https://cdimage.debian.org/cdimage/cloud/

time:

  # set /etc/adjtime to UTC when your hardware clock is UTC time, LOCAL to current zone time
  hwclock --show #show hardware clock
  date -R #show time
  tzselect


  ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime 
  cat /etc/adjtime
  #0.000000 1528473643 0.000000
  #1528473643
  #UTC

====== Command ======

  cat ~/.ssh/id_rsa.pub | ssh b@B 'cat >> .ssh/authorized_keys'