程序报错：第8行then附近有语法错误

!/bin/bash

usagefunc () {
  echo 用法: $0 Directory  Day;
  echo 例如: $0 `pwd`   `date +%d`;
}

if [ $# -ne 2 ] ; then
  usagefunc;
  exit;
fi
#判断输入日期的第一个数字是否为零，若为零则去掉
if [ $2 = "01" ] ; then M=1;   MONOK=1;
elif [ $2 = "02" ] ; then M=2; MONOK=1;
elif [ $2 = "03" ] ; then M=3; MONOK=1;
elif [ $2 = "04" ] ; then M=4; MONOK=1;
elif [ $2 = "05" ] ; then M=5; MONOK=1;
elif [ $2 = "06" ] ; then M=6; MONOK=1;
elif [ $2 = "07" ] ; then M=7; MONOK=1;
elif [ $2 = "08" ] ; then M=8; MONOK=1;
elif [ $2 = "09" ] ; then M=9; MONOK=1;
else M=$2; MONOK=1; 
fi

if [ $MONOK = 1 ] ;  then
  ls -l -R $1 | grep -e "$M";
else
  usagefunc;
fi