19:42 ~ 0 0 root @ vulcan # export PS1="\W \$ \\$ "
root $ # export PS1="\W \$? \\$ "
root 0 # export PS1="\W \$\? \\$ "
root $\? # export PS1="\W \$ \077 \\$ "
root $ ? # export PS1="\W \$\077 \\$ "
root 0 # bash --version
GNU bash, version 2.05b.0(1)-release (powerpc-unknown-linux-gnu)
Copyright (C) 2002 Free Software Foundation, Inc.
root 0 #