파일이름 자동변경 스크립트

#!/bin/bash
 
if [ $# -ne 3 ] ; then
    echo "move_filename2.sh <directory> <file1> <file2>"
    exit 1
fi
 
D_WORK=$1 
WORD1=$2
WORD2=$3
T_FILE1=/tmp/.tmp1 
 
ls -1 $D_WORK | grep "$WORD1$" > $T_FILE1
for FILE in `cat $T_FILE1`
do
    mv $D_WORK/$FILE `echo $D_WORK/$FILE | sed "s/$WORD1$/$WORD2/g"`
done