没有什么营养的东西，写写日志记录一下吧

shell脚本

root@pve:~/shell-dir# cat /root/shell-dir/shutdown_script.sh
#!/bin/bash

# stop all vm
qm list | awk '{if(NR>1) print $1}' | xargs -I {} qm stop {}

# wait 
sleep 3m

# shutdown
shutdown -h now

root@pve:~/shell-dir# 

crontab任务

root@pve:~/shell-dir# 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
0 21 20 1 * /bin/bash /root/shell-dir/shutdown_script.sh