一套自己写的生成三级不重复目录的SHELL脚本

#!/bin/sh
#
usage()
{
  printf  "input oldDIr number"
  read USERNAME1
  echo $USERNAME1
  USERNAME1_TIMES=$USERNAME1
  printf "input  newDir number"
  read USERNAME2
  USERNAME2_TIMES=$USERNAME2
  echo $USERNAME2
#  for i in `seq 3`
#  do
#  sleep 1s
#  echo ${i}"s"
#  done
  clear
}

return_oldDir(){
       #USERNAME1=315640	
       sum=$USERNAME1         
  #     echo $sum
       #315640,313642//956/912/824/ 
       idDir=""       
       for((i=0; i<3; i++))
       do
	    temp=`expr $sum % 999`
           # echo $temp
	    sum=`expr $sum + $temp`
	   # echo $sum
	    temp=`expr $temp + 1`	
            idDir=${idDir}${temp}"/"
       done 
       #echo "the oldDir is:"
      # echo $idDir
      #return idDir
}       
                                                                              
return_newDir(){       
	sum=$USERNAME1
        #;//315640,313642//956/912/824/        
        for((i=0; i<3; i++))
        do
	temp=`expr $sum % 999`     
        sum=`expr $sum / 999`         
        newidDir=${temp}"/"${newidDir}       
	done
	#echo "the newDir is:"
	#echo $newidDir
	#return newidDir;
}


usage
for((j=`expr $USERNAME1_TIMES - 0` ;j<`expr $USERNAME2_TIMES - 0`; j++))
do
return_oldDir
#echo  $idDir 
return_newDir
#echo $newidDir
source_old=${idDir}"*"
source_old_exit=${idDir%%/}
source_new=${newidDir%%/}
#echo $source_new
#echo $source_creat_dir
if [ -d $source_old_exit ]
then
if [ -d $source_new ]
then
echo "new dir exit"
else
echo "new dir not exit can makedir"
mkdir -p $source_new
echo ${source_new}"create"
chmod 777 $source_new
fi
cp -i $source_old $source_new
else
echo "old dir not exit"
fi
echo $source_old
#echo $source_new
newidDir=""
USERNAME1=`expr $USERNAME1 + 1`
USERNAME2=`expr $USERNAME2 + 1`
#echo $USERNAME1
#echo $USERNAME2
done
exit 0

 可惜了C++版本让我弄丢了  恶心