cal
From NetBSD Wiki
cal(1) cal displays a simple calendar. If arguments are not specified, the current month is displayed.
% cal
May 2006
S M Tu W Th F S
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
% cal 12 1980
December 1980
S M Tu W Th F S
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31
For people living in country where the first day of the week is Monday cal is more friendly used with the -d 1 parameter that put Mondays in the first column.
$ cal -d 1
March 2008
M Tu W Th F S S
1 2
3 4 5 6 7 8 9
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31
