4 examples for cal

  # display calendar for current month
cal

# display calendar for some year
cal 
        

  # print how the weeks were arrayed this month, last month, and next month
cal -3

# print how the weeks were arrayed last two months, this month, and next three months
cal -B 2 -A 3

# remind yourself of important dates of Middle Earth
grep Gandalf /usr/share/calendar/calendar.lotr
        

  cal 

cal 

cal -B  -F 
        

  # your_comment_here
# Example for command 'cal':
# displays a calendar for the current month.
#
# Exmaple for command 'cal 2020'
# displays calendar for the entire year 2020.