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

[Cliff Clive]

Basically I'm just looking for a command that can look up the name of the
directory of the script that is running.  If I move or copy the script to
another directory, it should be able to read the name of the new directory
without me having to edit the code.

Once I have identified the directory, I can insert it into the setwd()
command and continue with my program.
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