Shell Programming and Scripting

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