Replica of the linux command line program cal written in Ruby. It displays any month within the years 1800 to 3000.
in prompt type:
./cal month(one or two digits) year(four digits) [to display the given month] ./cal r4 year(four digits) or just year [to display all months for that year] ./cal r3 year(four digits) [to display all months for that year using three rows instead of four] ./cal r2 year(four digits) [to display all months for that year using two rows instead of four] ./ita_cal month(one or two) year(four digits) [it displays an Italian version of the calendar]