Linux – How to determine Linux kernel architecture

In general, just using yum is not sufficient for package compatibility. The rpm package format is relatively flexible, in the sense that it doesn't impose much by way of policy. The R package you want to use could be packaged such that they're distribution agnostic and just need to be unpacked via yum. However, it is more likely that they follow a whole host of assumptions about the distribution beyond yum itself — what libraries are available, what they're named, where they put their files (and what rpm packages those things come from).

In that case, you'll be best off with Red Hat Enterprise Linux itself, or with CentOS or Scientific Linux (both of which are built from the source packages provided by Red Hat). You may also be able to use Fedora, which is a community-built distribution in the same "family" (and generally much more desktop focused and bleeding edge).

If you can run the command as root, you can force the change to be accepted.

Example:

$ sudo passwd myusername
Changing password for user myusername.
New password: 
Retype new password: 
passwd: all authentication tokens updated successfully.