#!/bin/bash
# Declare array
declare -a ARRAY
# Link filedescriptor 10 with stdin
exec 10<&0
# stdin replaced with a file supplied as a first argument
exec < $1
let count=0

while read LINE; do
    ARRAY[$count]=$LINE
    ((count++))
done

#echo Number of elements: ${#ARRAY[@]}
#echo array's content
#echo ${ARRAY[@]
hadd $(basename $1).root ${ARRAY[@]}

# restore stdin from filedescriptor 10
# and close filedescriptor 10
exec 0<&10 10<&-
unset ARRAY