Figure 6.2: Changing the prompt
export NAME=value
export means to move the variable from the shell into the environment. This means that programs other than the shell (for instance, a file viewer) will be able to access it.
echo $PAGER
This is the easiest way to see the value of a variable. $PAGER tells the shell to insert the value of the PAGER variable before invoking the command. echo echoes back its argument: in this case, it echoes the current PAGER value, less.
man more
Displays the more manual. This time, man should have invoked the less pager.
less has lots of features that more lacks. For example, you can scroll backward with the b key. You can also move up and down (even sideways) with the arrow keys. less won’t exit when it reaches the end of the man page; it will wait for you to press q.