A macOS bash script monitors a specific directory, changes the permissions of any newly created files to '775', and logs these operations.

watch_and_chmod_public_folder_items.sh

#!/bin/bash

# 指定共享文件夹路径
DIRECTORY=/Users/faichou/Public

# 使用 fswatch 监视 DIRECTORY 目录，检测新文件的创建
fswatch -0 $DIRECTORY | while read -d "" NEWFILE
do
    # 当有新文件创建时，检查其权限是否为775，如果不是则使用 chmod 命令更改
    if [ -f "$NEWFILE" ]; then
        PERM=$(stat -f "%A" "$NEWFILE")
        if [ "$PERM" != "775" ]; then
            echo "$(date '+%Y-%m-%d %H:%M:%S'): Chmod 775 $NEWFILE"
            sudo chmod 775 "$NEWFILE" || true
        else
            echo "$(date '+%Y-%m-%d %H:%M:%S'): The file $NEWFILE already has 775 permissions"
        fi
    fi
done

# run with: nohup ./watch_and_chmod_public_folder_items.sh > logs/watch_and_chmod.log 2>&1 &