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Editorial Team
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Asked: 2026-06-11T06:53:46+00:00

I am looking for a way to test if R is being run from

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I am looking for a way to test if R is being run from RStudio. For some reason I could find the answer on google yesterday but not today, but I think it had to do with testing if a certain system variable was set.

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  1. Editorial Team

    There is no "running inside RStudio". RStudio is merely an IDE layer that wraps around R; at the end of the day it just launches the normal R executable you need to have on your $PATH anyway to operate RStudio.

    As a proxy, and as R Studio You could test available.packages() for the ‘manipulate’ package though, or as a shorter version see if RStudio added itself to the .libPaths() content:

    R> any(grepl("RStudio", .libPaths()))
[1] TRUE
R> 
R>

    Edit in May 2020 or eight years later The question does come up, and one can query a variety of things from within. Here is an example from the terminal of RStudio:

    $ env | grep -i rstudio | sort
GIO_LAUNCHED_DESKTOP_FILE=/usr/share/applications/rstudio.desktop
PATH=[...redacted...]
RMARKDOWN_MATHJAX_PATH=/usr/lib/rstudio/resources/mathjax-27
RS_RPOSTBACK_PATH=/usr/lib/rstudio/bin/rpostback
RSTUDIO=1
RSTUDIO_CONSOLE_COLOR=256
RSTUDIO_CONSOLE_WIDTH=111
RSTUDIO_PANDOC=/usr/lib/rstudio/bin/pandoc
RSTUDIO_PROGRAM_MODE=desktop
RSTUDIO_PROJ_NAME=chshli
RSTUDIO_SESSION_ID=9C62D3D4
RSTUDIO_SESSION_PORT=13494
RSTUDIO_TERM=2BD6BB88
RSTUDIO_USER_IDENTITY=edd
RSTUDIO_WINUTILS=bin/winutils
$

    Similarly, from within the R session:

    R> se <- Sys.getenv()
R> se[grepl("rstudio",se,ignore.case=TRUE)]
GIO_LAUNCHED_DESKTOP_FILE        /usr/share/applications/rstudio.desktop
PATH                             [...also redacted...]
RMARKDOWN_MATHJAX_PATH           /usr/lib/rstudio/resources/mathjax-27
RS_RPOSTBACK_PATH                /usr/lib/rstudio/bin/rpostback
RSTUDIO_PANDOC                   /usr/lib/rstudio/bin/pandoc
R>

    Edit in Aug 2021 or nine years later As all the answers listed here in the different answer may still be too much for people, you can also install package rstudioapi from CRAN and then ask it via rstudioapi::isAvailable() which comes back TRUE for me inside RStudio and FALSE in ESS / standard R.

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