Ok. So to be safe, it's a good idea to export the environment variable if it's defined in the .bashrc file.
new .bashrc example
SCREWED_UP=$SCREWED_UP:yep export SCREWED_UP
Or, more concisely but less portably (some older shells on Solaris for example don't support this syntax):
export SCREWED_UP=$SCREWED_UP:yep
Paul.
