Shell Programming and Scripting

#!/bin/bash
echo "This is a shell script to remove numbers divisible by 2 from an array"
if [ $# -gt 0 ]
then	# Use commnand line arguments as array elements.
	arr=($@)
else	# Use default array elements.
	arr=(1 6 9 12 15)
fi
case ${#arr[@]} in
(0)	echo 'Original array is empty.';;
(1)	echo "Original array element is ${arr[@]}.";;
(*)	echo "Original array elements are ${arr[@]}.";;
esac

# For each element in the array...
for (( i=0; i<${#arr[@]};  ))
do
	# ... determine if that element is evenly divisible by 2.
	if ((arr[i] % 2))
	then
		# Element i is not evenly divisible.  Evaluate next element.
		echo "Number (arr[$i]=${arr[i]}) is not divisible"
		((i++))
	else
		# Element i is evenly divisible; remove it from the array and
		# re-evaluate element i.
		echo "Number (arr[$i]=${arr[i]}) is divisible"
		arr=(${arr[@]:0:i} ${arr[@]:i+1})
		echo "Modified array is ${arr[@]}."
	fi
done
case ${#arr[@]} in
(0)	echo 'Final array is empty.';;
(1)	echo "Final array element is ${arr[@]}.";;
(*)	echo "Final array elements are ${arr[@]}.";;
esac