1.在linux /var/log/wtmp 日志中以二进制的形式记录了用户登陆的时间和登陆IP，用who 命令可以查看
who /var/log/wtmp

mtpt pts/0 2014-02-07 08:43 (192.168.0.5)
yunji pts/0 2014-02-08 09:29 (192.168.0.8)
langshi pts/1 2014-02-08 10:54 (192.168.0.7)
fanghui pts/0 2014-02-10 09:07 (192.168.0.11)
2.通过shell脚本可以分析出用户名，登陆时间，次数以及登陆ip
以html 格式输出，代码如下
#!/bin/bash
dt=$( date -dlast-day +%Y-%m-%d )
mkdir -p /usr/local/src/shellcode
u=('echo"$@"')
t=('echo"$@"')
i=('echo"$@"')
ur=('echo"$@"')
ti=('echo"$@"')
ip=('echo"$@"')
ci=('echo"$@"')
s=0
df=$(who /var/log/wtmp |grep "$dt"|awk ' { print $1 } '|sort |uniq|wc -l) #不同用户的个数
touch /usr/local/src/shellcode/ti.txt
touch /usr/local/src/shellcode/ip.txt
getUsermessage()
{
who /var/log/wtmp |grep "$dt" > /usr/local/src/shellcode/userlist
m=0
while read line
do
u[$m]=$( echo $line |awk ' { print $1 } ' )
t[$m]=$( echo $line |awk ' { print $4 } ' )
i[$m]=$( echo $line |awk '{ print $5 } '| sed -n "s/(//p"|sed -n "s/)//p" )
m=$[ $m + 1 ]
done < /usr/local/src/shellcode/userlist
}

getusername()
{
who /var/log/wtmp |grep "$dt"|awk ' { print $1 } ' |sort|uniq >/usr/local/src/shellcode/users
cat>/usr/local/src/shellcode/report.html<

do

tm+=$line+

done

ti[$s]=$tm
echo "hello ${ti[$s]}"
cat /dev/null >/usr/local/src/shellcode/ti.txt
while read line
do
pi+=$line+
done < /usr/local/src/shellcode/ip.txt
ip[$s]=$pi
echo "hello ${ip[$s]}"
cat >>/usr/local/src/shellcode/report.html<

done < /usr/local/src/shellcode/users
cat >>/usr/local/src/shellcode/report.html <

}

report()
{
i=0
cat>/usr/local/src/shellcode/report.html<

for (( ;i<$df; i++ ))
do
echo $i
echo ${ur[$i]}
cat >>/usr/local/src/shellcode/report.html<

done
cat >>/usr/local/src/shellcode/report.html <

}

getUsermessage

getusername

sed -i "s/+/;/g" /usr/local/src/shellcode/report.html