If just ‘-h’ is typed, a message is printed saying where further
help is available. It refers one to the various information options
(see Info options) and the on-line documentation
(see Support). If the stand-alone info program (the GNU
hypertext browser) is installed, one can enter
‘info FWEB’ at this time by typing ‘?’ or a space-separated
list of FWEB menu items such as ‘Macros FWEB built-in $PI’.
In fact, since ‘$PI’ appears in the detailed node listing, one can
simply type ‘$PI’. More generally, one can type anything that
info accepts on its command line (the option ‘-f FWEB’ is
implicit).
One can bypass the printed message and directly enter info by
specifying the info arguments as arguments to ‘-h’. For
example, on a UNIX system, one could type ‘-h'\$PI'’. Here
the dollar sign must be escaped because it has special significance to
the shell, and the quotes are necessary in order to preserve that escape
character as the argument is supplied to info. To get to the
top-level FWEB info directory, type
‘-h.’ or ‘-h'?'’.