Why not run crontab?

Key words: crontab, Shell, Y-send, Xauth, xhost

I wrote a script to run it on the terminal:

#! /Bin/ShExport display=:0Time='Awk '{Print $1}'/Proc/Uptime'Text="You have been running for $ {time %. *} hours. Please take a rest. The system will be shut down in 5 minutes. Please save it in time."If[$ {Time%. *}-Ge7200]ThenNotify-Send $ textFi
 

 

But it cannot be written to crontal:

# M h Dom mon Dow usercommand
* *** Root export display =:0& Amp;/home/XXX/policy.Sh
 

Why?

 

========================================================

Update: after finding the cause, modify it and OK.

First, you can use/home/cmdy. Sh>/home/log.txt 2> & 1
Deubg to check whether crontab is executed.

I can execute it, but the GUI is not displayed. Why. The display variable settings are incorrect.
However, display =: 0 is added to crontab.

Later, it was mentioned on the Internet that if the GUI is executed on the terminalProgramAfter switching to a user, you must reset the DISPLAY variable to display the data,
The reason is that the. Xauthority file already exists in the/home directory. If you use root to execute this variable, it cannot be displayed without resetting it;
Then I can use the original login user to execute the command, and change it to the following:

# M h Dom mon Dow usercommand*****Xxx(Myname)Export display =:0/Home/XXX/notify.Sh
 

Success!