R programming is a free and Open-source package used for data analysis. I will show you two ways to find which version of R is installed in your system
Method 1: Using R/R studio
Open R or R studio and type
version or R.Version()
This will bring you the following details
platform x86_64-redhat-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 3
minor 5.1
year 2018
month 07
day 02
svn rev 74947
language R
version.string R version 3.5.1 (2018-07-02)
nickname Feather Spray
Method 2: Using Terminal in Linux
Open Terminal and type in the command line
R --version
you will get the following result
[sulthan@sulthan-acer ~]$ R --version R version 3.5.1 (2018-07-02) -- "Feather Spray" Copyright (C) 2018 The R Foundation for Statistical Computing Platform: x86_64-redhat-linux-gnu (64-bit) R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under the terms of the GNU General Public License versions 2 or 3. For more information about these matters see http://www.gnu.org/licenses/.