Allow disabling a symbol macro with a macro environment, #'cl-macroexpand 2011-07-03 Aidan Kehoe <kehoea@parhasard.net> * cl.el (cl-macroexpand): Allow code to disable a given symbol macro while expanding code by prepending a cons with a nil cdr to the macro environment.

#!/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