学步园

工作中遇到一个小需求，需要对一系列的文件进行重命名。

原始格式是string_1.obj,现在想把文件名中的数字变成定长的，不足位数往前补零，即变成string_001.obj这种形式。

自己学着写了个脚本，很菜的，贴上来请大家指点一下。

#! /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"