Try searching the group sage-devel (and possibly sage-release) for "readline configuring R". The following thread might be useful, for example:
https://groups.google.com/forum/#!searchin/sage-devel/readline$20configuring$20r/sage-devel/B7y-ntx13Os/m2kJoygRxMYJ -- John -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org