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checknum(){
if [[ "$1" == *[^0-9]* || "$1" != *[0-9]* ]]
then
HELP; exit 3
fi
}

w=0
c=0
while [ $# -gt 0 ]
do
case $1 in
-h|--help) VERSION; HELP; exit
;;
-w)
...

Put the calculation of the memory into a function too. Call it only when needed - currently you call it all the time, makes no sense. It will be executed no matter what happens in the...