Check out the Linux OS Distributor

Vm>lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 10.04 LTS
Release: 10.04
Codename: lucid

Bioserver>lsb_release -a
LSB Version: :core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: RedHatEnterpriseServer
Description: Red Hat Enterprise Linux Server release 5.5 (Tikanga)
Release: 5.5
Codename: Tikanga

#Check out where is the executable file?

>which R

/usr/bin/R

>whereis R

R: /usr/bin/R /etc/R /usr/lib/R /usr/lib64/R /usr/local/lib/R /usr/share/R /usr/share/man/man1/R.1.gz