为指定目录的指定后缀文件首行添加“#coding:utf-8”

#!/bin/bash

function scandir() {
local cur_dir parent_dir workdir
workdir=$1
cd ${workdir}
if [ ${workdir} = "/" ]
then
cur_dir=""
else
cur_dir=$(pwd)
fi

for dirlist in $(ls ${cur_dir})
do
if test -d ${dirlist};then
cd ${dirlist}
scandir ${cur_dir}/${dirlist} $2
cd ..
else
local filename=$dirlist
if [[ ${filename:(-${#2})} = $2 ]]
then
exist=`cat $filename | sed -n '1p'| grep '#coding:utf-8'`
if [[ -z $exist ]]
then
echo "modifying file:"$filename
sed  -i 1'i\#coding:utf-8' $filename
fi

fi
fi
done
}

if test -d $1
then
scandir $1 $2
elif test -f $1
then
echo "you input a file but not a directory,pls reinput and try again"
exit 1
else
echo "the Directory isn't exist which you input,pls input a new one!!"
exit 1
fi

./add_utf8.sh /usr/lib/python2.7/dist-packages/nova/ .py