$COMP_LINE is not an environment variable. It is an internal variable, and it's only visible to the completion functions, not to other shell usage. (Most other internal variables are visible in declare.)

COMP_LINE not set despite bash completion being installed
I have a 2009 Honda Accord.  Over the past several months, I've noticed a grinding sound immediately after cold-starting the engine.  It only lasts for a fraction of a second, doesn't continue once the engine is running, and doesn't happen if I shut the engine off and start it again a few minutes later.

A little background:

The car has 92,000 miles on it.  I've noticed that it burns oil pretty quickly, so I keep an eye on it and make sure to add more if needed.  Most recently, I got an oil change with a high mileage synthetic, but that has not solved the issue.

Does anyone know what this could be?  Is it a big deal?  I'm obviously worried about damaging the engine.  Is this a major thing?  Or is it something I can live with, provided I don't mind the frightening noise that occurs on startup.

Any help you can give is greatly appreciated!
