Match User Identity

Here's a little snippet for check for the correct user id before your script goes on with its task.. I have used this so far in ksh scripts..

# Only the root user can run the ndd commands
if [ "`/usr/bin/id | /usr/bin/cut -c1-5`" != "uid=0" ] ; then
   echo "You must be the root user to run `basename $0`."
   exit 1
fi

Sometime, i would use this also..

# Only the root user can run the ndd commands
if [ "`/usr/ucb/whoami != "root" ] ; then
   echo "You must be the root user to run `basename $0`."
   exit 1
fi