fix OLDPWD and add __my_ps1_git

bashrc

@@ -498,7 +498,7 @@ then
     __my_cdef="\e[0m"
 fi
 _PS1="\
-${__my_c4}:: ${__my_cdef}[${__my_c1}\w/${__my_cdef}<${__my_c3}\${PWD}${__my_cdef}]\$(__my_ps1_bttry)\$(__my_ps1_ipaddr)\$(__my_ps1_moc)\n\
+${__my_c4}:: ${__my_cdef}[${__my_c1}\w/${__my_cdef}<${__my_c3}\${OLDPWD}${__my_cdef}]\$(__my_ps1_git)\$(__my_ps1_bttry)\$(__my_ps1_ipaddr)\$(__my_ps1_moc)\n\
 ${__my_c4}:: ${__my_c2}\u@\H${__my_cdef} \D{%a, %d %b %Y %T %z} ${SHELL} \V\n\
 ${__my_c4}:: ${__my_cdef}shlv:${SHLVL} cnum:\# jobs:\j last:\$? \$ "
 PS1=$_PS1