The cal command is used to display the current calendar, which is an abbreviation for calendar .
Syntax format: cal [parameter] [month] [year]
Common parameters:
Example
# 默认显示当月日历cal
# 显示最近三个月的日历cal -3
# 显示当年的日历cal -y
# 显示特定年月的日历，如2011年11月cal 11 2021
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