打开终端时出现'unknown option: --bash'错误的求助

大家好，我最近碰到个头疼的问题——每次打开终端，第一行都会弹出这条错误提示：
unknown option: --bash

这是我的终端截图：

下面是我的~/.bashrc文件内容：

# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options
HISTCONTROL=ignoreboth

# append to the history file, don't overwrite it
shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=1000
HISTFILESIZE=2000

# check the window size after each command and, if necessary,
# update the values ...

备注：内容来源于stack exchange，提问作者abcdefgh