Linux.com: CLI Magic: When

“If you’re the type of geek who likes tools and apps that are
fast and lean, and you’re not afraid of getting a little CLI under
your fingernails, When is a good choice for your personal calendar.
Even better, it’s easy enough to install and use, and well enough
documented, that you don’t have to be a geek to take advantage of

“In many Debian-flavored distributions, installation is as easy
as sudo apt-get install when. You can also find the When source
code, Debian, and Gentoo packages on the project’s homepage. When
is written in Perl and does not require compilation, so
installation from source code is easy for anyone who can find their
way to the command line…”