Creating if statement for nfs

Shell Programming and Scripting
1

What would be correct syntax in a script to check to see if a /export/nfs/home mount point is mounted and if not stop/abort? OS is Solaris 10 using standard VI ksh shell. Here is the script. Please tell me where you see the problem.

#!/bin/bash
#
# This script is run as root to sync AMI PROD to DR.
#
#

# Verify we are effectively root
#if ($> != 0){
#       warn "must be root to use this script\n";
#       usage();
#}

if [[ `grep -qs /export/nfs/home` /etc/dfs/sharetab ]]; then
    echo "filesystem mounted running rsync"
else
    echo "Aborted because filesystem not mounted"
    exit -1
fi

#Rotate log before beginning
/usr/local/bin/logrotate -f ./conf/logrotate.conf

#### Perform the rsync now ####

/usr/local/bin/rsync -anvz -e ssh --rsync-path=/usr/local/bin/rsync root@prod03:/export/nfs/home/ root@dr03:/export
/nfs/home/
~