Customize Bash Prompt String

1. Install sexy-bash-prompt
2. Modifying the prompt symbol ('PROMPT_SYMBOL') in ~/.bash_prompt
   In Bash 4.2+, add the following line at the beginning.
   PROMPT_SYMBOL=$'\u21AA'
   In Bash 4.1 or earlier, add the following line at the beginning.
   PROMPT_SYMBOL=$'\xe2\x86\xaa'
3. Then source ~/.bash_prompt
4. UTF8 code for additional symbols may be found at UTF-8 Arrows
5. Assigning UTF8 code to variables was demonstrated in Awesome symbols and characters in a bash prompt
6. Hex code for UTF8 symbols can be found through echo ↪ | hexdump -C, for example.