在个人虚拟机上安装了oracle 10g 11g rac 下面是切换脚本命令
#10g rac >11g rac****************************************###############
cat /etc/inittab > /etc/inittab10g
cat /etc/inittab11g > /etc/inittab
#
rm -rf /etc/oracle10g
mv /etc/oracle /etc/oracle10g
cp -rp /etc/oracle11g /etc/oracle
#
cat /etc/oraInst.loc > /etc/oraInst.loc10g
rm -rf /etc/oraInst.loc
cp -p /etc/oraInst.loc11g /etc/oraInst.loc
#
cat /etc/oratab > /etc/oratab10g
rm -rf /etc/oratab
cp -p /etc/oratab11g /etc/oratab
#
rm -rf /var/tmp/.oracle10g
mv /var/tmp/.oracle /var/tmp/.oracle10g
mv /var/tmp/.oracle11g /var/tmp/.oracle
#11g rac >10g rac****************************************###############
cat /etc/inittab > /etc/inittab11g
cat /etc/inittab10g > /etc/inittab
#
rm -rf /etc/oracle11g
mv /etc/oracle /etc/oracle11g
cp -rp /etc/oracle10g /etc/oracle
#
cat /etc/oraInst.loc > /etc/oraInst.loc11g
rm -rf /etc/oraInst.loc
cp -p /etc/oraInst.loc10g /etc/oraInst.loc
#
cat /etc/oratab > /etc/oratab11g
rm -rf /etc/oratab
cp -p /etc/oratab10g /etc/oratab
#
rm -rf /var/tmp/.oracle11g
mv /var/tmp/.oracle /var/tmp/.oracle11g
mv /var/tmp/.oracle10g /var/tmp/.oracle
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
都提前备份
-r-xr-xr-x 1 root root 2436 Oct 6 09:47 /etc/init.d/init.crs
-r-xr-xr-x 1 root root 5538 Oct 6 09:47 /etc/init.d/init.crsd
-r-xr-xr-x 1 root root 5538 Oct 6 09:47 /etc/init.d/init.crsd.bak
-r-xr-xr-x 1 root root 55180 Oct 6 09:47 /etc/init.d/init.cssd
-r-xr-xr-x 1 root root 55180 Oct 6 09:47 /etc/init.d/init.cssd.bak
-r-xr-xr-x 1 root root 3505 Oct 6 09:47 /etc/init.d/init.evmd
-r-xr-xr-x 1 root root 3505 Oct 6 09:47 /etc/init.d/init.evmd.bak
-rwxr-xr-x 1 root root 8782 Oct 17 11:32 /etc/init.d/init.ohasd
-rwxr-xr-x 1 root root 8782 Oct 17 11:32 /etc/init.d/init.ohasdbak
-rwxr-xr-x 1 root root 10999 Oct 17 11:33 /etc/init.d/init.tfa
-rwxr-xr-x 1 root root 10999 Oct 17 11:33 /etc/init.d/init.tfabakoracle 10g 11g rac 虚拟环境切换
原文：http://blog.csdn.net/itdba/article/details/40210051
