shell-backward-kill-word in Bash 4.1

If you haven't install bash4.1; download it from:
http://ftp.gnu.org/gnu/bash/
and install
add short cut key in ~/.inputrc like below:
"/C-j":shell-backward-kill-word
logout and login again;
and then in bash shell prompt, try to type like below:
zkl@user-desktop:~/source/bash-4.1$ cd /usr/bin
and then press ctrl+j
when happen? the string: "/usr/bin" has been killed!

this function is what I was looking for these days!

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