How to extract .tar.xz to selected folder?

It's simple
tar -xJvf archive-file.tar.xz -C ~/dest/folder/name
Also simple for regular .tar.gz files
tar -xzvf archive-file.tar.gz -C ~/dest/folder/name

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How to install Plank Dock on Debian 8 - simple dock for Debian

Plank homepage is here:
0. Download & extract sources
1. Install dependencies
sudo apt-get install automake gnome-common intltool pkg-config valac libbamf3-dev libdbusmenu-gtk3-dev libgdk-pixbuf2.0-dev libgee-dev libglib2.0-dev libgtk-3-dev libwnck-3-dev libx11-dev libgee-0.8-dev
2. Compile and install
sudo make install
3. Update shared libraries
sudo ldconfig
4. Run plank, or plank preferences window
plank &
plank --preferences
Source solution is here

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