History manipulation in bash only reminds me why I have both the current commands history number and the last return code in my prompt. I don't need colors, or

History manipulation in bash only reminds me why I have both the current commands history number and the last return code in my prompt. I don't need colors, or anything fancy in my prompt, but those two things I find to be really useful. export PS1='[\u@\h \W](\!/$?)$ '