cs-x-y.sh

domains=1
instances=1
usage(){                                                                           
    echo "usage: $0 [-d domains] [-i instances]"
    echo "  -d number of domains to create (defaults to 1)"
    echo "  -i number of instances to create (defaults to 1)"
    echo "  -h (prints this help)"
} 

while getopts d:i:h opt                                                    
do                                                                                 
    case "$opt" in                                                                 
      d)  domains="$OPTARG";;                                                      
      i)  instances="$OPTARG";;                                                                                                         
      h)  usage                                                                    
          exit 0;;                                                                 
      /?)       # unknown flag                                                     
          usage                                                                    
          exit 1;;                                                                 
    esac                                                                           
done
                                                                               
echo Creating $domains Domains
echo Creating $instances Instances
// Use captured variables to do stuff here...