Systemd

systemd is a suite of basic building blocks for a Linux system. It provides a system and service manager that runs as PID 1 and starts the rest of the system.

archlinux Wiki
i3wm 普通用户关机 重新安装 polkit 即可

root

• systemctl = systemctl --system
• systemctl enable NetworkManager = systemctl --system enable NetworkManager
• systemctl enable sshd = systemctl enable sshd --system
• systemctl enable update-system.timer = systemctl --system enable update-system.timer

poweroff

systemctl poweroff

reboot

systemctl reboot

Show system status

systemctl status

List running units

systemctl
systemctl list-units

List failed units

systemctl --failed

List installed unit files

systemctl list-unit-files

not root

参考archlinux wiki
offers the ability to manage services under the user’s control with a per-user systemd instance,enabling them to start, stop, enable, and disable their own user units
systemctl --user Connect to user service manager

• systemctl --user enable mpd
• systemctl --user start mpd

systemd/Timers

There are many cron implementations, but none of them are installed by default as the base system uses systemd/Timers instead.
archlinux Wiki
systemd.timer
systemd.time 执行时间策略
systemd.exec

file path

• /etc/systemd/system/update-system.timer
• /etc/systemd/system/update-system.service

update-system.timer

[Unit]
Description=update system weekly

[Timer]
OnCalendar= Fri *-*-* 12:00:00

[Install]
WantedBy=timers.target

update-system.service

[Unit]
Description=update system weekly

[Service]
ExecStart=pacman -S -y --noconfirm -u

查看定时任务

systemctl list-timers
systemctl list-timers --all

开机激活定时器

systemctl enable update-system.timer

取消开机激活定时器

systemctl disable update-system.timer

手动激活定时器

systemctl start update-system.timer

手动停止定时器

systemctl stop update-system.timer

查看定时器状态

systemctl status update-system.timer

OnCalendar

systemd-analyze calendar weekly
systemd-analyze calendar "Mon *-*-* 00:00:00"

注意 / 仅用于月份