unity 不能识别 atlas ，需要将目录下所有 .atlas 改成 .atlas.txt 

    1. #!/bin/sh
    3. function rename_atlas() {
    4.     for file in `ls $1`
    5.     do
    6.         if test -f $1"/"$file
    7.         then
    8.             if [ "${file##*.}"x = "atlas"x ];then
    9.                 mv $1"/"$file $1"/"$file.txt
    10.             fi
    11.         else
    12.             rename_atlas $1"/"$file
    13.         fi
    14.     done
    15. }
    17. rename_atlas $1