Where -p is the priority or facility level contained within syslog.
其中- p表示syslog中包含的优先级或设备级别(facility level)。
Basically, the selector field selects what facility will be logged (for example, kern, user, mail, LPR) and what priority the facility has.
基本上,selector字段选择要记录的工具(例如,kern、user、mail、lpr)和工具拥有的优先级。
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