#!/bin/bash 
IFS="|" 
if [ $# -lt 1 ] 
then 
        echo "Usage: `basename $0` <file(s)>" 
fi 
  
prepend_string="20030803_" 
  
for file in $@ 
do 
        file_mod=`echo "$prepend_string""$file"` 
        if [ "$file" != "$file_mod" ] 
        then 
                mv "$file" "$file_mod" 
                echo "$file --> $file_mod" 
        fi 
done