一个统计Linux用户登陆时间的脚本

#!/bin/bash
#This script is used to general a statistics report for user login
#ken.zhang
while :
do
read -p "please input username:" username
count=`cat /etc/passwd|cut -d: -f1|grep -c "$username\>"`
#count=`grep -c $username /etc/passwd`  # 非精确匹配，输入roo 等也会计算在内，不符合要求。
if [ $count -eq 0 ];then
echo "Not a valid user!!!"
continue;
else
logintime=`last|grep -c "$username"`
if [ $logintime -eq 0 ];then
echo "User never login via console!!!"
continue;
fi
fi
hour=`last|grep -E 'pts|tty'|grep "$username"|grep -v 'still'|awk -F '(' '{print $2}'|awk -F ')' '{print $1}'|awk -F ':' '{sum+=$1};END{print sum}'`
min=`last|grep -E 'pts|tty'|grep "$username"|grep -v 'still'|awk -F '(' '{print $2}'|awk -F ')' '{print $1}'|awk -F ':' '{sum+=$2}END{print sum}'`
let "fhour=$hour+$min/60"
let "fmin=$min%60"

cat << EOL
########## User Login Report #########
--- User Name --- Total Login Time ---
$username          $fhour hour $fmin min
EOL
done