以前总是看到这个文件，而且后面还总是跟着不同的参数。但是一直都不知道是做啥的，收集一下：
rootcrs.pl - Configure Oracle Clusterware
rootcrs.pl [-verbose] [-upgrade | -patch] [-hahome
[-paramfile
[-deconfig | -downgrade] [-force] [-lastnode]
[-downgrade] [-oldcrshome
[-unlock [-crshome
Options:
-verbose Run this script. in verbose mode
-upgrade Oracle HA is being upgraded from previous version
-patch Oracle HA is being upgraded to a patch version
-hahome Complete path of Oracle Clusterware home
-paramfile Complete path of file specifying HA parameter values
-lastnode Force the node this is executing on to be considered the
last node of the install and perform. actions associated
with configuring the last node
-downgrade Downgrade the clusterware
-version For use with downgrade; special handling is required if
downgrading to 9i. This is the old crs version in the format
A.B.C.D.E (e.g 11.1.0.6.0).
-deconfig Remove Oracle Clusterware to allow it to be uninstalled or reinstalled.
-force Force the execution of steps in delete that cannot be verified
to be safe
-unlock Unlock CRS home
-crshome Complete path of crs home. Use with unlock option.
-oldcrshome For use with downgrade. Complete path of the old crs home.