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Crontab 未运行任务

tag-icon • tag-icon cron 19.04 schedule notify-send
Crontab 未运行任务

crontab -e然后我确实添加了*/2 * * * * /usr/bin/notify-send "test"，它应该每 2 分钟发送一次通知，但它不起作用。

crontab 文件如下所示。

# 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

*/2 * * * * /usr/bin/notify-send "test"

答案1

我认为 Cron 是作为系统守护进程运行的，并且不知道您的桌面环境会话，尽管它需要显示通知。您可以编写脚本，发送通知并休眠 2 分钟，然后在后台以用户身份运行它。此外，如果您想要的正是 Cron，您可以创建脚本，该脚本首先导出桌面标识符export DISPLAY=:0，然后notify-send从 Cron 调用并调用此脚本，或者只需将您的 Cron 行替换为*/2 * * * * DISPLAY=:0 /usr/bin/notify-send "test"。

注意 - 对我来说它起作用乌buntu 16.04 但不在钾ubuntu 19.10。尚未在其他系统版本上测试过。

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