when `debug', abort when lisp error during loadup loadup.el: When featurep `debug-xemacs' (configure --with-debug), set debug-on-error, so that we get an exit-to-debugger/assertion failure upon Lisp error during loadup. Unset before dumping. cmdloop.c: During really-early-error-handler, exit to the debugger and abort if an error occurs and lisp.h: extern Vdebug_on_error.

#!/bin/sh
if
test -r $2
then
if
cmp $1 $2 > /dev/null
then
echo $2 is unchanged
rm -f $1
else
mv -f $1 $2
fi
else
mv -f $1 $2
fi