pyenv/libexec/rbenv-global

#!/usr/bin/env bash
set -e

RBENV_VERSION="$1"
RBENV_VERSION_FILE="${RBENV_HOME}/global"

if [ -n "$RBENV_VERSION" ]; then
  rbenv-version-file-write "$RBENV_VERSION_FILE" "$RBENV_VERSION"
else
  rbenv-version-file-read "$RBENV_VERSION_FILE" ||
  rbenv-version-file-read "${RBENV_HOME}/default" ||
  echo system
fi