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Opening a shell
Depending on your operating system, there are different ways to open a shell (or a terminal)
Linux
If you are working on a linux box and you have X window support1), right click on the screen and a pop-up window will appear.

If you select the item Terminal a shell will open in your browser.

If that doesn't work, simply open the “Activities” menu by either clicking on the text in the upper left corner or by hitting the “Windows” key. Then, type 'terminal' and click on “Terminal” or “Terminator”.
Mac OS
If you are using Mac OS, just open Applications - Utilities - Terminal Alternatively, you can install XQuartz, which provides support for the X windows system as well.

Once you have started the terminal something like the following will appear

Windows
Most Windows operating systems don't ship with a terminal application. We suggest to install MobaXterm.
After downloading the installer, double-click it and click through the installation process.
Once you have started MobaXterm, you can start an emulated BASH shell by clicking on “Start local terminal” on the welcome screen (Figure 5).
