How to automatically install a program bash suggests I install?
If you set the environment variable COMMAND_NOT_FOUND_INSTALL_PROMPT to 1, like
export COMMAND_NOT_FOUND_INSTALL_PROMPT=1
you will be ask if you want to install the package:
me@myhost:~$ tiger
The program 'tiger' is currently not installed. You can install it by typing:
sudo apt-get install tiger
Do you want to install it? (N/y)
If you answer y it will run
sudo apt-get install tiger
See How do I set environment variables? for how to set environment variables.