How to fix permission issues of Oracle RAC?

#run as root (GRID_HOME is just for convenience)：
export GRID_HOME=/home/app/12.2.0.1/grid
export PATH=$GRID_HOME/perl/bin:$PATH:$GRID_HOME/OPatch
$GRID_HOME/bin/crsctl stop crs
$GRID_HOME/crs/install/rootcrs.sh -unlock
$GRID_HOME/crs/install/rootcrs.sh -lock
#$GRID_HOME/crs/install/rootcrs.sh -patch  -->12.1 should run this command and 12.2 does not support this option
These above two options mostaly are used for RAC database patching, and the effect is like:
$GRID_HOME/crs/install/rootcrs.sh -init
for single instance GI (Oracle Restart)：
$GRID_HOME/crs/install/roothas.sh -init
For 11.2，need to replace rootcrs.sh/roothas.sh with rootcrs.pl/roothas.pl
As the default Perl in the system maybe is not compatiable with the Oracle perl script, so the recommended way to run them is as below:
$GRID_HOME/perl/bin/perl rootcrs.pl

add x permission to following files under GI ORACLE_HOME
# chmod +x $GRID_HOME/bin/crs*
# chmod +x $GRID_HOME/crs/install/rootcrs.sh
run rootcrs.sh
# cd $GRID_HOME/crs/install
# rootcrs.sh -patch

#run as grid user：
cluvfy comp software -n $(hostname) -verbose

cat crsconfig_dirs|grep -E '(^all|^unix)'|grep -v "$GRID_HOME/racg/usrco"|while read unused fname owner group permission; do
chown $owner:$group $fname || echo failed on $fname
chmod $permission $fname || echo failed on $fname
done
chmod 755 $GRID_HOME/racg/usrco
 
cat crsconfig_fileperms|grep -E '(^all|^unix)'|while read unused fname owner group permission; do
chown $owner:$group $fname || echo failed on $fname
chmod $permission $fname || echo failed on $fname
done

#run as grid user
cluvfy comp software -n $(hostname) -verbose |grep 'PRVG-2033.*did not match the expected'|awk -F\" '{print $2" "$6}' > /tmp/grid.perm
#run as root user：
cat /tmp/grid.perm|while read fname permission; do
chmod $permission $fname || echo failed on $fname
done

ls -l $GRID_HOME/bin/oracle
-rwsr-s--x 1 grid oinstall 373913824 Dec 24  2019 /home/app/12.2.0.1/grid/bin/oracle
#If the result is different, then correct it using root user：
chown grid:oinstall $GRID_HOME/bin/oracle
chmod 6751 $GRID_HOME/bin/oracle

#On the normal database, run as root:
cd $ORACLE_HOME
find . -type d -exec stat -c "%n %U %G %a" {} \; > /tmp/orahome.dir
find . -type f -exec stat -c "%n %U %G %a" {} \; > /tmp/orahome.file
 
#On the target database, run as root：
cd $ORACLE_HOME
cat /tmp/orahome.dir|while read fname owner group permission; do
[[ -d $fname ]] && { chown $owner:$group $fname || echo failed on $fname; }
[[ -d $fname ]] && { chmod $permission $fname || echo failed on $fname; }
done
 
cat /tmp/orahome.file|while read fname owner group permission; do
[[ -f $fname ]] && { chown $owner:$group $fname || echo failed on $fname; }
[[ -f $fname ]] && { chmod $permission $fname || echo failed on $fname; }
done

ls -l $ORACLE_HOME/bin/oracle
-rwsr-s--x 1 oracle asmadmin 409357968 May 27 07:18 /home/app/oracle/product/12.2.0.1/db1/bin/oracle
#If it is different, then correct it using root user
chown oracle:asmadmin $ORACLE_HOME/bin/oracle
chmod 6751 $ORACLE_HOME/bin/oracle