我正在关注 Ryan 的 RailsCast 第 339 集。我已经安装了 rbenv 并且可以运行ruby -v. 我退出了我的会话，当我试图回来时（通过su deployerfrom root，我得到了这个错误
/home/deployer/.rbenv/bin/rbenv: line 20: cd: /root: Permission denied
这是rbenv文件：
#!/usr/bin/env bash
set -e
[ -n "$RBENV_DEBUG" ] && set -x
resolve_link() {
$(type -p greadlink readlink | head -1) "$1"
}
abs_dirname() {
local cwd="$(pwd)"
local path="$1"
while [ -n "$path" ]; do
cd "${path%/*}"
local name="${path##*/}"
path="$(resolve_link "$name" || true)"
done
pwd
cd "$cwd"
}
if [ -z "${RBENV_ROOT}" ]; then
RBENV_ROOT="${HOME}/.rbenv"
else
RBENV_ROOT="${RBENV_ROOT%/}"
fi
export RBENV_ROOT
if [ -z "${RBENV_DIR}" ]; then
RBENV_DIR="$(pwd)"
else
cd "$RBENV_DIR" 2>/dev/null || {
echo "rbenv: cannot change working directory to \`$RBENV_DIR'"
exit 1
} >&2
RBENV_DIR="$(pwd)"
cd "$OLDPWD"
fi
export RBENV_DIR
shopt -s nullglob
bin_path="$(abs_dirname "$0")"
for plugin_bin in "${RBENV_ROOT}/plugins/"*/bin; do
bin_path="${bin_path}:${plugin_bin}"
done
export PATH="${bin_path}:${PATH}"
hook_path="${RBENV_HOOK_PATH}:${RBENV_ROOT}/rbenv.d:/usr/local/etc/rbenv.d:/etc/rbenv.d:/usr/lib/rbenv/hooks"
for plugin_hook in "${RBENV_ROOT}/plugins/"*/etc/rbenv.d; do
hook_path="${hook_path}:${plugin_hook}"
done
export RBENV_HOOK_PATH="$hook_path"
shopt -u nullglob
command="$1"
case "$command" in
"" | "-h" | "--help" )
echo -e "rbenv 0.3.0\n$(rbenv-help)" >&2
;;
* )
command_path="$(command -v "rbenv-$command" || true)"
if [ -z "$command_path" ]; then
echo "rbenv: no such command \`$command'" >&2
exit 1
fi
shift 1
exec "$command_path" "$@"
;;
esac
第 20 行是cd "$cwd"
当我尝试回到会话时为什么会出现此错误的任何想法？