Shell scripts

Commands can be combined together in a file which can then be executed. As an example, copy the following into your favourite text editor:

while :
do
echo Raspberry Pi!
done

Save this with the name fun-script. Before you can run it you must first make it executable; this can be done by using the change mode command chmod. Each file and directory has its own set of permissions that dictate what a user can and can't do to it. In this case, by running the command chmod +x fun-script, the file fun-script will now be executable. You can then run it by typing ./fun-script (assuming that it's in your current directory). This script infinitely loops and prints Raspberry Pi!; to stop it, press Ctrl + C. This kills any command that's currently being run in the terminal.