#!/bin/ksh
#  script to rename files with a numeric preference.
#  useful for converting MP3 files that you want numbered sequentially.
#
#   establish starting count
count="1"
#   establish loop... RUN script in the directory where the files are located.
for a in `ls`
do
#  change cp to mv to rename, cp used for testing to prevent damage to
#    files.   The underscore must be contained in quotes.
cp $a $count"_"$a
#  increment variable count by one.
count="$((count+1))"
# continues until all files in ls are numbered
done