I need the icon to minimize windows and show desktop. I can't find a decent guide. Can you help me?
The first step, install
sudo apt-get install wmctrl
Description from the wmctrl homepage:
The wmctrl program is a UNIX/Linux command line tool to interact with an EWMH/NetWM compatible X Window Manager. The tool provides command line access to almost all the features defined in the EWMH specification. It can be used, for example, to obtain information about the window manager, to get a detailed list of desktops and managed windows, to switch and resize desktops, to make windows full-screen, always-above or sticky, and to activate, close, move, resize, maximize and minimize them. The command line access to these window management functions makes it easy to automate and execute them from any application that is able to run a command in response to an event.
Next step, download and install script, prepared by me:
cd /tmp && wget https://github.com/png2378/showdesktop/archive/master.zip unzip master.zip && cd showdesktop-master sudo mv showdesktop /usr/local/bin/ && sudo mv showdesktop.desktop /usr/share/applications/ && sudo mv showdesktop.svg /usr/share/icons/elementary/apps/48/
The finish step, add icon on Plank:
mv showdesktop.dockitem ~/.config/plank/dock1/launchers/