[R] Looking up the directory a file is located in

[Cliff Clive]

So it sounds like the best we can do in R is to keep track of the script in a
sort of master file that runs the script, and set the working directory in
the master.  Is that accurate?

In Python any time you run a script, there is a built-in "__file__" variable
that can tell you the file name of the script itself.  It would be nice to
have a feature like this in R.
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