Bash script to increment no in file name

bash.sh

#!/usr/bin/env bash

set -e

# find existing version of static.zip
cd ios;

name=$(ls | grep static)
echo 'grep name: '$name

## remove existing static zip file

rm $name

## remove static
name=${name:7} 
echo 'remove static: '$name

## remove .zip
i=${name:0:${#name}-4}

echo "version no:" $i

((i++));
echo "increment no: "$i

name=static-$i
echo $name

cd .. 

echo 'Zipping static to iOS'
zip -r  ios/$name static