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列出所有已经加载的 systemd units
systemctl systemctl | grep docker.service
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列出所有的 service
systemctl list-units --type=service systemctl --type=service
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列出所有active状态（运行或退出）的服务
systemctl list-units --type=service --state=active
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列出所有正在运行的服务
systemctl list-units --type=service --state=running
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列出所有正在运行或failed状态的服务
systemctl list-units --type service --state running,failed
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列出所有enabled状态的服务
systemctl list-unit-files --state=enabled
