pyenv/bin/rbenv-versions

#!/bin/bash -e

RBENV_VERSION="$(rbenv-version)"

for path in ~/.rbenv/versions/*; do
  if [ -d "$path" ]; then
    version="${path##*/}"

    if [ "$version" == "$RBENV_VERSION" ]; then
      echo "* $version"
    else
      echo "  $version"
    fi
  fi
done