cal ncal palshow whole year
cal [year] ncal [year]show specific month
cal [month] [year] ncal [month] [year]show 20 lines
pal -c 20show previous, current and next month
cal -3 ncal -3show the next [n] months
ncal -A [n]show the previous [n] months
ncal -B [n]show week numbers
ncal -w # default: weeks start on sunday ncal -w -M # weeks start on Monday ncal -w -S # weeks start on Sunday ncal -w -b # old style format