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日志
1.windows 2 Linux /var/log 3. ios 4 vrp
facility.priority
facility auth, authpriv, cron, daemon, kern, lpr, mail, mark, news, security
(same as auth), syslog, user, uucp and local0 through local7
priority debug, info, notice, warning, warn (same as warn-ing), err, error (same as err), crit, alert, emerg, panic (same as emerg)
mail.warn
mail.!warn
mail.=warn
wail.!=warn
nfs
网络文件系统 2 3 sun linux unix 资源共享
/etc/exports
目录 客户（权限，参数）
exportfs -rv
nis 网络信息服务 rpc portmap
作用：集中身份验证