Slow bash tab completion update

[John Cromartie]

I did 'set -vx', according to Eric Blake's advice.

Tab completion appears to get hung up for a very long time on 'read -r
tmp', but only on certain paths...

I have no idea why or how to do anything about it, though. 'read -r
tmp' works as expected when I run it from the shell.

-John

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