[R] directory of current script

[pdb]

I am running a series of scripts sequentially and they all need some global
parameters. These will be included in a file in a known sub directory as the
scripts themselves.

The scripts need to be run by anyone without ANY editing.

Question is: 

Is there a command to return the directory of the current script, so it then
knows where to find the global parameter file? 

Or is there a simpler way?

Cheers.

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