drush $PATH silverbullet

silverbullet.local/.profile

@@ -1,3 +1,4 @@
 export PATH=/opt/local/bin:/opt/local/sbin:$PATH
 [[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" 
 export NODE_PATH=/Users/david/.nvm/v0.4.7/lib/node_modules
+PATH=$PATH:~/drush