#linux日志存放路径
[root@root log]#cd /var/log
[root@root log]# ls
anaconda chrony cron-20200120 maillog messages-20191222 secure wtmp
audit cloud-init.log cron-20200126 maillog-20191222 messages-20200120 secure-20191222 yum.log
boot.log cloud-init-output.log dmesg maillog-20200120 messages-20200126 secure-20200120 yum.log-20200120
btmp cron dmesg.old maillog-20200126 ppp secure-20200126
btmp-20200120 cron-20191222 lastlog messages sa tuned
#查看前5行日志信息
[root@root log]# head -5 messages
#查看最后5行日志信息
[root@root log]# tail -5 messages
supplement
两个重要的系统日志文件
messages :State recording system or service running information and misinformation
secure(安全) :user login information, file information can be monitored to check whether there are too many fail record, to judge whether the server attack
tail -f 文件路径 Been tracking view the file contents change
