shell脚本实现仅保留某目录下最新的两个文件

 #!/bin/sh
 
 export DS_DIR=/home/cxy/test
 
 if [ ! -d $DS_DIR ]; then
     mkdir $DS_DIR
 else
     echo "$DS_DIR is not existed!"
 fi
 
 cd $DS_DIR
 if [ $(ls -l | grep "install-*" | wc -l) >  ]; then
     echo "more than 2 dst_files in $DS_DIR"
     rm -r $(ls -rt | head -n2)
 fi