tzselect is called without any parameters from the shell. It shows a list of about one dozen geographic areas one can roughly recognize as continents. After choosing a geographic area by number, a list of countries and cities in this area will be shown.
You can press the Enter key to reprint the list. To choose a timezone, just press the number left to it. If your input is invalid, the list will be reprinted.
You may press Ctrl-C to interrupt the script at any time.
Note that tzselect will not actually change the timezone for you. Use 'dpkg-reconfigure tzdata' to achieve this.
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