Snarfer watches the snarf buffer for changes.
Each time a program changes the snarf buffer contents,
snarfer copies the new contents and then takes over control
of the buffer.
Because the snarf buffer contents are managed by
snarfer instead of by individual programs, the contents remain
available even after the program that wrote them exits.
-v option, intended for debugging, causes
snarfer to print the new snarf buffer contents each time it changes.
On Mac OS X,
snarfer keeps the X11 snarf buffer in sync with the Carbon snarf buffer,
working around a bug in the OS X X11 server.
for more details.