cal [month] [year]
The cal command writes a human-readable calendar on the standard output.
With no arguments, cal displays a calendar for the current month of the current year. If one argument is given and it is numeric, cal interprets it as a year (for example, 1991); if a single argument is not numeric, cal interprets it as the name of a month, possibly abbreviated (for example, apr). When two arguments are given, cal assumes that the first argument is the month (either a number from 1 to 12 or a month name) and the second is the year.
When set, this environment variable causes months and days of the week to be displayed as defined in the current locale. By default, PTC MKS Toolkit utilities display months and days of the week in English.
Possible exit status values are:
Failure due to any of the following:
x/OPEN Portability Guide 4.0. All UNIX systems. Windows 7. Windows Server 2008 R2. Windows 8. Windows Server 2012. Windows 10. Windows Server 2016.
Year numbers less than 100 refer to the early Christian era, not the current century. This command prints the Gregorian calendar, handling September 1752 correctly. Many cultures observe other calendars.
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