在deepin20.3中怎样才能通过crontab定时任务弹出我想要的提示框？

zenity 只能在用户权限下运行和显示。

如果定时任务是 root 权限，请加上 su 用户名 -c "zenity xxxxxxxx" 这样子指定用户运行。

试下 env DISPLAY=:0 su 用户名 -c "zenity --info --text=a" 这样子，我这里可以在 tty2 用 root 给 tty1 用户发 zenity 窗口。

非图形界面下调用要手动指定屏幕 $DISPLAY

可以用crontab来实现你的要求。这里做一个例子，每隔一分钟弹出一个窗口。窗口的内容是当前时间和用户。

步骤：

1.ctrl+alt+t打开终端

2.输入crontab -e

输入如下内容，然后保存（我使用的是vim用:wq来退出，如果是nano用ctrl+x来保存退出）

* * * * *  /bin/bash -c "DISPLAY=:0  zenity --info --text='$(whoami;date)'"

使用crontab -l来检查是否生效

$ crontab -l
# Edit this file to introduce tasks to be run by cron.
# 
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
# 
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').
# 
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
# 
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
# 
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
# 
# For more information see the manual pages of crontab(5) and cron(8)
# 
# m h  dom mon dow   command
* * * * *  /bin/bash -c "DISPLAY=:0  zenity --info --text='$(whoami;date)'" 

3. 最后效果