pyenv/libexec/rbenv-global

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#!/usr/bin/env bash
set -e
[ -n "$RBENV_DEBUG" ] && set -x
RBENV_VERSION="$1"
RBENV_VERSION_FILE="${RBENV_ROOT}/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_ROOT}/default" ||
echo system
fi