Crontab关闭命令不起作用
我希望Crontab每天关闭系统，但它没有这样做，我拼错了什么？ 这是我的Crontab文件：
/etc/crontab: system-wide crontab Unlike any other crontab you don't have to run the `crontab' command to install the new version when you edit this file and files in /etc/cron.d. These files also have username fields, that none of the other crontabs do. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin mh dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly 25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) 47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) 52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly ) 每天凌晨02:30关机
30 0 2 * * * /sbin/shutdown -h now
没关系，但我对Ubuntu有点新，所以我在终端打开Crontab -e，它看起来像这样：
# 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 am # 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) # mh dom mon dow command 30 02 * /sbin/shutdown -h now
所以我应该在最后键入我的命令或如何？ 以及如何保存它，因为我很困惑。
您已将crontab配置为错误，请执行以下操作：
-
在终端类型：
sudo crontab -e -
然后给它的条目如下：
30 02 * * * /sbin/shutdown -h now
尝试/sbin/poweroff只是没有实现。 对我有用的是
$ sudo crontab -e
然后
# mh dom mon dow command 30 2 * * * sudo poweroff