rbenv: no such command `shell' on Ubuntu

[scalopus]

Hi, I have issue as below

warun@Warun-DDPC:/.phpenv/libexec (master)$uname -a
Linux Warun-DDPC 3.8.0-31-generic #46-Ubuntu SMP Tue Sep 10 20:03:44 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
warun@Warun-DDPC:/.phpenv/libexec (master)$cat /etc/issue
Ubuntu 13.04 \n \l

warun@Warun-DDPC:~/.phpenv/libexec (master)$tail ~/.bashrc
parse_git_branch() {
git branch 2> /dev/null | sed -e '/^[^_]/d' -e 's/_ (.*)/(\1)/'
}
PS1="${debian_chroot:+($debian_chroot)}[\033[01;32m]\u@\h[\033[00m]:[\033[01;34m]\w[\033[31m] $(parse_git_branch)[\033[00m]$[\033[00m]"

source ~/.git-pairing-prompt.sh

export PS1="[$(__git_pairing_prompt)] "

export PATH=$PATH:$HOME/.phpenv/bin:$HOME/.phpenv/shims

eval "$(rbenv init -)"
warun@Warun-DDPC:/.phpenv/libexec (master)$source /.bashrc
warun@Warun-DDPC:/.phpenv/libexec (master)$phpenv version
system (set by /home/warun/.phpenv/version)
warun@Warun-DDPC:/.phpenv/libexec (master)$phpenv shell
rbenv: no such command `shell'
warun@Warun-DDPC:~/.phpenv/libexec (master)$ls |grep shell
rbenv-sh-shell

Do I missing anything?