1) allow only parms that are defined in PARM_ARRAY
2) Syntax function to print out the function commands.

#Syntax of script
syntax() {
#redirect STDOUT to STDERR so that this can be called via another script
t=”"
echo “`basename $0` – Script to xxx1>&2
echo 1>&2
echo “`basename $0` –Parm1= –Parm2= [--Parm3] [--Debug]“1>&2
echo 1>&2
if [ -n "$1" ] ; then
echo ” $1″ 1>&2
fi
exit 0
}

#Function to verify that only paramters in PARM_ARRAY are passed
PARM_ARRAY=(PARM1 PARM2 PARM3 DEBUG HELP)
function ParmExists() {
if [ -z "$1" ]; then
return
fi
for i in ${PARM_ARRAY[@]}; do
if [ $i == $1 ]; then
return 1
fi
done
return 0
}

#FROM http://www.opensourcery.co.uk/2008/04/parsing-parameters-bash-shell-script/
# all parms are in the form _PARM
# Parms not starting with ‘–’ result in error
# NOTE: PARM_ARRAY + ParmExists are used to prevent extraneous parms i.e. –NotAParm=Anything
until [[ ! "$*" ]]; do
if [[ ${1:0:2} = '--' ]]; then
PAIR=${1:2}
PARAMETER=`echo ${PAIR%=*} | tr [:lower:] [:upper:]`
ParmExists $PARAMETER
retval=$?
if [ $retval -eq 0 ] ; then
syntax “Unknown parameter $1″
fi
eval _$PARAMETER=’${PAIR##*=}’
else
syntax “Invalid parameter $1″
fi
shift
done

#Show Help
if [ -n "$_HELP" ] ; then
syntax
fi