Display a calendar
SYNTAX cal [-mjy] [[month] year] options: -m Display monday as the first day of the week. -j Display julian dates (days one-based, numbered from January 1). -y Display a calendar for the current year. A single parameter specifies the 4 digit year (1 - 9999) to be displayed. Two parameters denote the Month (1 - 12) and Year (1 - 9999). If arguments are not specified, the current month is displayed. A year starts on 01 Jan.
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