cal command is a calendar command in Linux which is used to see the calendar of a specific month or a whole year.

Syntax:
cal [ [ month ] year]

Rectangular bracket means it is optional, so if used without option, it will display a calendar of current month and year.

    $ cal
       February 2020
    Su Mo Tu We Th Fr Sa
                                        1
     2  3  4  5  6  7  8
     9 10 11 12 13 14 15
    16 17 18 19 20 21 22
    23 24 25 26 27 28 29

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