How do I test if R is running as Rscript?

Question

I have code in a single R file that I want to be able to source (i.e., to define my functions etc.) within RStudio during development, and also run using the #! /usr/bin/env Rscript syntax via the command line (actually, using Hadoop). For the latter, I need the last thing that Rscript does to be to kick off the analysis (i.e., using a call to a main() function). For the former, I don't want my main() function called. I'd like to be able to test if the code is running within Rscript (or, alternatively, within RStudio), so that I can either execute main() or not. Is this possible, please?

One solution would be to break my code into multiple files, but I'd rather avoid this if possible (to make the Hadoop stuff slightly easier).

Thanks in advance.

Thanks for mentioning RStudio - I wasn't aware of this software program until now, but I'm glad I 'found' it. — Jos, Mar 20 '12 at 12:43
No worries, Jura25. It's much less mature than the Matlab or Mathematica front ends, but does the job very well for R. — Chris, Mar 20 '12 at 13:43

score 14 · Accepted Answer · edited Mar 19 '12 at 19:52

14

You could use interactive to test if R is running in interactive mode. interactive will return FALSE under Rscript and TRUE under (most?) GUIs.

edited Mar 19 '12 at 19:52

mdsumner

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answered Mar 19 '12 at 19:03

Joshua Ulrich

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Thanks Joshua. I can't believe I didn't find this… – Chris Mar 19 '12 at 19:10
After 9+ years I still find this useful. BTW `interactive()` returns a TRUE even when used inside a file that is sourced, in Rstudio. Is that expected? – Lazarus Thurston Dec 01 '21 at 08:16
@LazarusThurston: yes, that's expected. RStudio is an interactive console, so it's `TRUE` even if you `source()` a file. – Joshua Ulrich Dec 09 '21 at 14:42

How do I test if R is running as Rscript?

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