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NB when you run this gcal command in your shell, holidays are highlighted
but this highlighting does not show in the sample output (above).
To find full details on gcal options: gcal --long-help | less
Example for United States, Pennsylvania:
gcal -K -q US_PA 2009 # display holidays in USA/Pennsylvania for 2009 (with week numbers)
Example for Hong Kong:
gcal -K -q HK 2009 # display holidays in Hong Kong for 2009 (with week numbers)
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