Bash script to find diffs only in files from your feature between stage with multiple features

diff_feature_staging.sh

#!/bin/bash
STAGING_BRANCH=staging
DEVELOP_BRANCH=develop
BRANCH_NAME=`git branch --list | fzf`
COMMON_PARENT_COMMIT_HASH=`git merge-base $BRANCH_NAME $DEVELOP_BRANCH`
comm -12 <(git diff $BRANCH_NAME staging --name-only) <(git diff $COMMON_PARENT_COMMIT_HASH $BRANCH_NAME --name-only) \
|  xargs -I{} git diff staging $BRANCH_NAME -- {}