以 root 身份在用户显示上运行命令未按预期工作

Question

我正在尝试xdotool从 root shell 在用户的显示器上执行操作（移动鼠标），但我得到：

# DISPLAY=:0 mousemove_relative 1 1
No protocol specified
Error:Can't open display: (null)
Failed creating new xdo instance
#

为什么这不起作用？

---

剧本：

#!/bin/bash

exec=`/usr/sbin/nethogs -t -c 1| awk '/smbd/ {print $2}'`

sent=$exec

echo "result: "$sent
sent=$(echo "($sent+0.5)/1" | bc)
echo "rounded: "$sent
if [[ $sent -gt 0 ]]
then 
    echo "music is playing"
    `DISPLAY=:0 xdotool mousemove_relative 1 1`
else
    echo "quiet"
fi

---

我得到了这个/var/mail/root：

Waiting for first packet to arrive (see sourceforge.net bug 1019381)
result: 6.73438
rounded: 7
music is playing
No protocol specified
Error: Can't open display: (null)
Failed creating new xdo instance

Answer 1

我在https://www.reddit.com/r/linux/comments/2clob0/help_with_cron_though_its_probably_not_really_a/?st=j7e4jv37&sh=e83bf930上找到了答案

我必须将以下内容添加到脚本中：

export DISPLAY=:0
export XAUTHORITY=/home/username/.Xauthority