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files=( *.m2v )for i in ${!files[@]}; do    rand_date[i]=$(( $((RANDOM%37)) + 1970 ))$(printf "%02d" $((RANDOM%12 + 1)) )$(printf "%02d"  $((RANDOM%30 +1)) )    touch -d ${rand_date[i]} ${files[i]}doneIN_FILES=( $(ls -t -1 ${files[@]} )