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$ which R
/usr/bin/R
$ ls -l /usr/bin/R
-rwxr-xr-x 1 root root 8589 Oct 25 2013 /usr/bin/R
$ chown -R my_account_name /usr/bin/R
chown: changing ownership of ‘/usr/bin/R’: Operation not permitted
$ chgrp -R my_group /usr/bin/R
chgrp: changing group of ‘/usr/bin/R’: Operation not permitted
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