If you need to quickly generate a quick monthly calendar from the command line, just type in
cal [number of the month] [year]
Man Page for “CAL”
DESCRIPTION
cal displays a simple calendar. If no arguments are specified, the current month is displayed.
OPTIONS
-1, –one
Display single month output. (This is the default.)
-3, –three
Display prev/current/next month output.
-s, –sunday
Display Sunday as the first day of the week.
-m, –monday
Display Monday as the first day of the week.
-j, –julian
Display Julian dates (days one-based, numbered from January 1).
-y, –year
Display a calendar for the current year.
-V, –version
Display version information and exit.
-h, –help
Display help screen and exit
PARAMETERS
A single parameter specifies the year (1 – 9999) to be displayed; note the year must be fully specified: cal 89 will not display a calendar for 1989. Two parameters denote the month (1 – 12) and year.
Three parameters denote the day (1-31), month and year, and the day will be highlighted if the calendar is displayed on a terminal. If no parameters are specified, the current month’s calendar is displayed. A year starts on Jan 1. The first day of the week is determined by the locale. Ten days following that date were eliminated by the reformation, so the calendar for that month is a bit unusual.