[OS] Moving .csv files

#!/bin/bash
if [ $# -ne 2 ]
then
    echo "USAGE: `basename $0` imenik_od imenik_do"
    exit 1
fi
if [ ! -d $2 ]
then
    mkdir -p $2
fi
FROM=$1
TO=$2
files=`ls -l $FROM | grep ^- | grep [A-Z][A-Z]*\.csv$ | awk 'print $9'`
for file in $files
do
    filename=`awk -F. {print $1}`
    #first cut+paste the .csv files
    mv ${FROM}${file} ${TO}${file}
    #then rename(change) their extension
    mv ${TO}${file} ${TO}${filename}.moved_csv
done
sum_filesizes=`ls -l $TO | grep ^- | awk '$9~/\.moved_csv$/ {print $5}' | awk 'BEGIN {total=0} {total+=$1} END {print total}'`
echo "Vkupnata golemina na premestenite datoteki e $sum_filesizes"