If you want to have fortune cookies displayed on your host as well, you'll have to download the cookie database and install the program to select and display a cookie.
Simply download the source files from the download directory and place them into
/usr/share/games/fortunes or into a directory of their
own (you need the .dat files as well). You can use wget to download
the files. Some German fortune cookies are also included in the fortunes-de package.
Additionally you'll need to install the fortune
command as well, which Debian ships in the fortune-mod
package. When the files were placed in the global directory, a simple
call to fortune should display a random cookie.
If that is done, simply place a command similar to the followings
into your /etc/profile, ~/.bash_profile or
~/.bashrc file (or similar if you are using a different
shell).
echo /usr/games/fortune infodrom-linux linux echo |
echo /usr/games/fortune ~/fortunes/ echo |
The first command reads cookies from two files in the global directory. If you remove the filenames the file is chosen randomly. The second command chooses a cookie database in the given directory and displays a random cookie from it.
Depending on the place used to insert these commands you'll get a fortune cookie displayed each time you log in into your machine or whenever a new shell is spawned.