翻译自：
- https://unix.stackexchange.com/questions/371797/unprintable-characters-as-input-in-command-line
- https://unix.stackexchange.com/questions/35369/how-to-define-tab-delimiter-with-cut-in-bash
简单说，使用bash命令，如printf。
传入’\t’的样例代码为：
python example.py --delim $'\t'