How to return user name in a script even if run by SUDO?

[Smoot Carl-Mitchell]

On Tue, 2009-04-07 at 22:55 -0700, Sundar Nagarajan wrote:

> why not just use ${SUDO_USER:-$USER}
> will return ${SUDO_USER} if set (when inside a sudo shell) and return 
> ${USER} otherwise (not inside a sudo shell).

That will work as well.  I had forgotten that particular shell syntax.
Good catch!
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Smoot Carl-Mitchell
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