Beside date command, Linux also has cal command to display calendar. As its name, cal just show you the calendar in many ways.
There is also ncal command which has same function with cal. Let’s start.
1) Run cal
Cal is a built-in command which shipped in every Linux distribution. To run cal, just type cal on your console.
2) Display calender in full year view
To display it in full year view, put the year you want to view after cal command or use -y year parameter. Let say you want to view 2013 calendar.
$ cal 2013
$ cal -y 2013
3) Show specific month
To fulfill this, we can use -m month_name parameter. Here’s a sample :
$ cal -m Feb
As you can see, you can type in the full name of the month or simply abbreviated course.
4) Print Julian days
Julian days is days one-based which numbered from January 1. To print calender in this format, use -j parameter.
$ cal -j
On Julian calender, we see that December 7, 2013 is converted into day 341 in 2013 year.
5) Display 3 months calender
You can display calender in 3 month format. One for previous, current and next month. Use -3 parameter to do it.
$ cal -3
6) Display the number of month after the current month
If you need to do it, use -A number parameter.
$ cal -A 2
7) Display the number of month before the current month
If you need to do it, use -B number parameter.
$ cal -B 2
8) Print week numbers
To show a week number, we can not use cal command. This time, we use ncal command.
$ ncal -w
Ncal print a portrait view. The week numbers are printed on the bottom of each months.
9) Weeks start on Monday
By default, weeks start on Sunday. If you want to start on Monday, you can use -M parameter. Once again, this parameter is applied to ncal command only.
$ ncal -M
10) Display country codes
To print country codes in calendar, we can use -p parameter. This parameter also only applied to ncal command.
$ ncal -p
The difference between cal and ncal are the view orientation and the parameters of each other. For example, -w parameter to print week numbers, can not be used in cal command. You will get an error message like :
Usage : cal [general options] [-hjy] [[month] year] cal [general options] [-hj] [-m month] [year] ncal [general options] [-bhJjpwySM] [-s country_code] [[month] year] ncal [general options] [-bhJeoSM] [year] General options : [-NC3] [-A months] [-B months] For debug the highlighting: [-H yyyy-mm-dd] [-d yyyy-mm]
But they producing the same function that giving us the information about calendar.