Linux

Ubuntu/Debian

See /Packaging in Debian

Tweaks

Keyboard & layouts

My preferences:

  • Caps as Ctrl
  • LCtrl enables English layout
  • RCtrl enables Russian layout
  • RAlt switches to other layout when pressed
  • PrtSc works as the Compose key

How to

  1. # /etc/default/keyboard
XKBMODEL="pc105"
XKBLAYOUT="us,ru"
XKBVARIANT=","
XKBOPTIONS="compose:prsc,ctrl:nocaps,grp:lctrl_rctrl_switch,grp:switch"
  2. sudo dpkg-reconfigure keyboard-configuration

Discrete GPU

$ glxinfo | grep "OpenGL renderer"
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics ...
$ # hmm
$ DRI_PRIME=1 glxinfo | grep OpenGL renderer
OpenGL renderer string: AMD HAINAN ...
$ # a-ha!
$ DRI_PRIME=1 ./game

Customizing xdg-open

Example of .desktop file (put in ~/.local/share/applications):

[Desktop Entry]
Version=1.0
Name=GNU Emacs (GUI)
GenericName=Text Editor
Comment=GNU Emacs is an extensible, customizable text editor - and more
MimeType=text/english;text/plain;text/x-makefile;text/x-c++hdr;text/x-c++src;text/x-chdr;text/x-csrc;text/x-java;text/x-moc;text/x-pascal;text/x-tcl;text/x-tex;application/x-shellscript;text/x-c;text/x-c++;
Exec=/usr/bin/emacsclient -c %F
Icon=emacs25
Type=Application
Terminal=false
Categories=Utility;Development;TextEditor;
StartupWMClass=Emacs
Keywords=Text;Editor;

How to get the type:

$ mimetype foo.jpg

How to associate app (its .desktop file) with type:

$ xdg-mime default imv.desktop image/jpeg

(source)