Linux command line: cal

Huh, there’s a command called cal that’s apparently installed with most Linux distros.

# cal
     March 2017
Su Mo Tu We Th Fr Sa
          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

I really need to browse /uer/bin/ someday.