閑人草堂

#! /bin/bash
# this script is used to rename files
# the orignal filename is as XXXX_1.obj
# and the final filename is as XXX_0001.obj the width of the num  is given as a parameter

rm result.txt
export suffix=".obj"
find . -name "*$suffix" > result.txt
cat result.txt | while read oneline
do
	export orifilename=${oneline##*/}    #cut off the path of filename
	export prefilename=${orifilename%_*} #without "_"
	
	export numfilename=${oneline##*_}
	export numfilename=${numfilename%.*} #get the num in filename

	((i=$1-${#numfilename})) #get the num of zero which is  needed

	export zeros=`echo $numfilename | awk '{printf "%0'"$i"'d",0}{print}'` 
	export finalfilename=$prefilename"_"$zeros$suffix

	#echo "$orifilename, $finalfilename"

	#	rename "s/$orifilename/$finalfilename/" ./$finalfilename
	mv $orifilename $finalfilename
done
echo "Done"