为什么从 ~/.profile 调用 gdbus 输出不起作用？

如果我打开一个终端并运行以下脚本，它工作正常。调用中的值gdbus被写入lockScreenTest.txt文件。屏幕锁定时值为 true，屏幕解锁时值为 false。

#!/bin/bash
while true; do 
    echo "$(gdbus call -e -d com.canonical.Unity -o /com/canonical/Unity/Session -m com.canonical.Unity.Session.IsLocked)" >> lockScreenTest.txt
    sleep 2
    echo "called" >> lockScreenTest.txt
done

但是，如果我将此行添加./lockScreenCheck.sh&到~/.profile并重新启动计算机，则输出gdbus不会写入lockScreenTest.txt. 相反，仅写入以下输出：

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called

called  

gdbus为什么从 运行脚本时输出不可用~/.profile？
我正在对此进行调查，因为我编写了一个 Java 程序，该程序需要检查屏幕是否被锁定，并且我正在使用大致以下命令进行操作：

String command = "gdbus call -e -d com.canonical.Unity -o /com/canonical/Unity/Session -m com.canonical.Unity.Session.IsLocked";
p = Runtime.getRuntime().exec(command);
p.waitFor(); 

与 bash 脚本一样，如果我从带有 的终端运行 Java 程序，它也可以正常工作java -jar program.jar，但如果我从 调用它~/.profile，Java 程序会运行，但 gdbus 命令的输出是难以捉摸的。