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+## Name
+
+cal - Display a calendar
+
+## Synopsis
+
+```**sh
+$ cal [[[day] month] year]
+```
+
+## Description
+
+This program displays a simple calendar. If no arguments are specified, the current month is displayed with the current day highlighted.
+
+Days, months and years are specified with numbers. Week starts at Sunday.
+
+## Examples
+
+```sh
+# Display the current month
+$ cal
+    12 - 1992    
+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
+
+# Display any month
+$ cal 03 2019
+     03 - 2019     
+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                  
+
+# Display an entire year
+$ cal 2000
+                              Year 2000                           
+
+     01 - 2000              02 - 2000              03 - 2000      
+Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
+                   1          1  2  3  4  5             1  2  3  4
+ 2  3  4  5  6  7  8    6  7  8  9 10 11 12    5  6  7  8  9 10 11
+ 9 10 11 12 13 14 15   13 14 15 16 17 18 19   12 13 14 15 16 17 18
+16 17 18 19 20 21 22   20 21 22 23 24 25 26   19 20 21 22 23 24 25
+23 24 25 26 27 28 29   27 28 29               26 27 28 29 30 31   
+30 31                                                             
+     04 - 2000              05 - 2000              06 - 2000      
+Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
+                   1       1  2  3  4  5  6                1  2  3
+ 2  3  4  5  6  7  8    7  8  9 10 11 12 13    4  5  6  7  8  9 10
+ 9 10 11 12 13 14 15   14 15 16 17 18 19 20   11 12 13 14 15 16 17
+16 17 18 19 20 21 22   21 22 23 24 25 26 27   18 19 20 21 22 23 24
+23 24 25 26 27 28 29   28 29 30 31            25 26 27 28 29 30   
+30                                                                
+     07 - 2000              08 - 2000              09 - 2000     
+Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
+                   1          1  2  3  4  5                   1  2
+ 2  3  4  5  6  7  8    6  7  8  9 10 11 12    3  4  5  6  7  8  9
+ 9 10 11 12 13 14 15   13 14 15 16 17 18 19   10 11 12 13 14 15 16
+16 17 18 19 20 21 22   20 21 22 23 24 25 26   17 18 19 20 21 22 23
+23 24 25 26 27 28 29   27 28 29 30 31         24 25 26 27 28 29 30
+30 31                                                             
+     10 - 2000              11 - 2000              12 - 2000     
+Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa   Su Mo Tu We Th Fr Sa
+ 1  2  3  4  5  6  7             1  2  3  4                   1  2
+ 8  9 10 11 12 13 14    5  6  7  8  9 10 11    3  4  5  6  7  8  9
+15 16 17 18 19 20 21   12 13 14 15 16 17 18   10 11 12 13 14 15 16
+22 23 24 25 26 27 28   19 20 21 22 23 24 25   17 18 19 20 21 22 23
+29 30 31               26 27 28 29 30         24 25 26 27 28 29 30
+                                              31                  
+```