data=`ls -lt $1 |tr -t [' '] ['\t']|tr -s '\t'|cut -f3,5` 
count=0 
flag=1 
sum=0 
users_flag=1 
check=0 
declare -a users 
for a in $data 
do 
    if [ $users_flag -eq 1 ] 
    then 
        for ((i = 0; $i <= count; $i++)) 
        do 
            if [ $a = ${users[$count]} ] 
            then 
                flag=0 
                break 
            fi 
        done 
        if [ $flag  -eq 1 ] 
        then 
            users[$count]=$a 
            count=expr`$count + 1` 
            echo $a >> userdata 
        fi 
        users_flag=0 
    else 
        if [ $flag -eq 1 ] 
        then 
             
            for b in $data 
            do 
                if [ $check -eq 0 ] 
                then 
                    if [ $b = $a ] 
                    then  
                        check=1 
                    fi 
                else 
                    sum=`expr $sum + $b` 
                    check=0 
                fi  
            done 
        fi 
    fi 
done