Loop through git branches and pick specific string from every branch

gistfile1.sh

#!/bin/bash

# list all branches
git for-each-ref --format='%(refname:short)' refs/heads |
while read branch; do
    # if [[ $branch == ru_template32 ]]; then
    #     exit 0
    # fi
    echo $branch
    git checkout $branch
    echo $branch >> ~/dev/app_colors.txt
    grep -Eo "TEAM_COLOR \[UIColor colorWithRed:\([0-9.]+\/[0-9.]+\) green:\([0-9.]+/[0-9.]+\) blue:\([0-9.]+/[0-9.]+\) alpha:1\]" ./app-ios/Customization.h >> ~/dev/app_colors.txt
    
done