We are going to start what we could call a new section in Fromlinux, where we will show you things related to the terminal: Tips, Applications, Commandos… Etc.
We will start with two very simple applications: Calendar y Callus.
calendar.
We open a terminal and write:
$ calendar
And we will have as a result:
As we can see, we will get a kind of anniversaries of what is commemorated on the current day and the next, some very interesting data by the way 
Cal & NCal
When we execute both commands in the terminal (one first and the other later), we will get something like this:
Two simple calendars to know what day we are living in. What do you think?