参见man logger

facility：设施，从功能或程序上对日志进行归类

auth, authpriv, cron, daemon,ftp,kern, lpr, mail, news, security(auth),

user, uucp, local0-local7, syslog

Priority： 优先级别，从低到高排序

debug, info, notice, warn(warning), err(error), crit(critical), alert, emerg(panic)

参看帮助： man 3 syslog