For some newsreaders and mailers the above is all you need to do to
set up your signature.  For example the default behaviour of pine(1),
tin(1), and the rn family - rn(1), trn(1), strn(1), & Pnews(1) - is
to automatically append ~/.signature, if it exists.  To check that
it's working, follow the instruction in "1.3 Testing Your Signature."

If you use Elm, Mail, SUN OpenWindows Mailtool, Emacs Mail Mode, MH,
NN, or GNUS you need to follow the additional instructions described
below.  If you use Pine, you can change it's default signature
behaviour by following the instructions below.