case $# in  //$#表示轉(zhuǎn)入?yún)?shù)的個(gè)數(shù)，sh bak.sh ./ .sh 有二個(gè)參數(shù)./和.sh
0)                     // 參數(shù)為空時(shí)，提示錯(cuò)誤，并且退出
echo "message:param is wrong"
exit $E_BADARGS;;
esac

string=" "

cd $1      //進(jìn)入傳入的目錄

//備份子目錄中的文件時(shí)，參數(shù)也要接上
if [ $# -gt "1" ]
then
 string=$string" "$2
fi

for filename in *   //讀取當(dāng)前目錄中的文件
do
 if [ -d "$filename" ]     //判斷一下是不是目錄
 then
 /bin/sh /home/zhangy/test/$0 $(pwd)/$filename $string    //是目錄的話，進(jìn)行遞歸
 else
 if [ $# -gt "1" ] && [ ${filename:(-${#2})} = $2 ]    //指定備份什么樣的文件
 then
 cp $filename $filename"bak"
 fi
 if [ $# -eq "1" ]
 then
 cp $filename $filename"bak"  //沒指定，備份目錄下面的所有文件
 fi
 fi
done
exit 0

case $# in
0|1|2)
echo "message:param is wrong"
exit $E_BADARGS;;
esac

string=" "
cd $1

if [ $# -gt "2" ]
then
 string=$string" "$2" "$3
fi

for filename in *
do
 if [ -d "$filename" ]
 then
 /bin/sh /home/zhangy/test/$0 $(pwd)/$filename $string
 else
 if [ $# -gt "2" ] && [ ${filename:(-${#2})} = $2 ]
 then
 mv $filename  ${filename%$2}$3
 fi
 fi
done
exit 0

case $# in
0|1)
echo "message:param is wrong"
exit $E_BADARGS;;
esac

string=" "
cd $1

if [ $# -gt "1" ]
then
 string=$string" "$2
fi

for filename in *
do
 if [ -d "$filename" ]
 then
 /bin/sh /home/zhangy/test/$0 $(pwd)/$filename $string
 else
 if [ $# -gt "1" ] && [ ${filename:(-${#2})} = $2 ]
 then
 rm -f $filename
 fi
 fi
done
exit 0