file_util

cp_in_order.sh

When you need file copy in order

usage: bash cp_in_order.sh src_mp3_dir dest_mp3_dir

batch_rename.sh

usage: bash batch_rename.sh target_dir

Replace spaces in file names

find -name "* *" -type d | rename 's/ /_/g'    # do the directories first
find -name "* *" -type f | rename 's/ /_/g'