-[ -d ~/Applications ] && PATH=~/Applications:"${PATH}"
-[ -d ~/bin ] && PATH=~/bin:"${PATH}"
-[ -d ~/sbin ] && PATH=~/sbin:"${PATH}"
+[ -d ~/Applications -a ! -e ~/Applications/.not_in_path ] \
+ && PATH=~/Applications:"${PATH}"
+[ -d ~/bin -a ! -e ~/bin/.not_in_path ] \
+ && PATH=~/bin:"${PATH}"
+[ -d ~/sbin -a ! -e ~/sbin/.not_in_path ] \
+ && PATH=~/sbin:"${PATH}"