linux common commands emergency response

端口查看

netstat -anplt | more

 

查看进程：

ps - ef
 ps aux
 ps aux | grep pid

Timing Tasks View

crontab

 

查看文件

CAT File full display
 head - 5  File  // First 5 rows 
tail - 5  File  // 5 after line shows

 

t00ls大佬分享的技巧
1、定位有多少IP在爆破主机的root帐号：

grep "Failed password for root" /var/log/secure | awk '{print $11}' | sort | uniq -c | sort -nr | more

 

定位有哪些IP在爆破： 

grep "Failed password" /var/log/secure|grep -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)"|uniq -c 

 

爆破用户名字典是什么？ 

grep "Failed password" /var/log/secure|perl -e 'while($_=<>){ /for(.*?) from/; print "$1\n";}'|uniq -c|sort -nr 

 

2、登录成功的IP有哪些： 

grep "Accepted " /var/log/secure | awk '{print $11}' | sort | uniq -c | sort -nr | more 

 

登录成功的日期、用户名、IP： 

grep "Accepted " /var/log/secure | awk '{print $1,$2,$3,$9,$11}' 

文章来源：https://www.jianshu.com/p/b1962c7a3c0d