warning: here-document at line 7 delimited by end-of-file (wanted `rui')

[root@yrzl-cloud-aio ~]# sh b.sh
b.sh: line 12: warning: here-document at line 7 delimited by end-of-file (wanted `rui')
b.sh: line 13: syntax error: unexpected end of file
[root@yrzl-cloud-aio ~]#
[root@yrzl-cloud-aio ~]#
[root@yrzl-cloud-aio ~]# ls
anaconda-ks1.cfg  CentOS-7-x86_64-DVD-1511.iso  ifcfg-enp9s0  iso    ll    m.sh     packages  qinrui    rr    sou                   yr-cloud-picture-static-ip.iso
anaconda-ks.cfg   i                             ins-packages  k.sh   mmmm  n.sh     pgs       r         rrrr  wget-log
b.sh              ifcfg-enp8s0                  i.sh          ks.sh  mn    package  p.sh      rpmbuild  ruiy  yr-cloud-picture.iso
[root@yrzl-cloud-aio ~]#
[root@yrzl-cloud-aio ~]#
[root@yrzl-cloud-aio ~]# cat b.sh
#!/bin/bash
i=0
for ifMacs in `ifconfig  | grep ether | awk -F' ' '{print $2}' | head -n 2`
do
        #echo $ifMacs
        if [ -z /etc/udev/rules.d/70-persistent-ipoib.rules ];then
        cat >> /etc/udev/rules.d/70-persistent-ipoib.rules <<rui
        SUBSYSTEM==\"net\", ACTION==\"add\", DRIVERS==\"?*\", ATTR{address}==\"${ifMacs}\", ATTR{dev_id}==\"0x0\", ATTR{type}==\"1\", KERNEL==\"eth*\", NAME=\"eth{i}\"
        ruiy
        fi
i=$((i + 1))
done
[root@yrzl-cloud-aio ~]#