Set file permissions 775 for dirs and 664 for files

file_permissions.sh

#!/bin/bash
#
# This will set
# Directories: 775 (read-write-exec for owner and group, read-exec for others)
# Files: 664 (read-write for owner and group, read for others)
# for all files expect .git folder.
# --> Remove `-name .git -prune -o` to extend it to git files.

find . -name .git -prune -o -type d -exec chmod 775 {} \;
find . -name .git -prune -o -type f -exec chmod 664 {} \;