用shell脚本写出检测/tmp/size.log文件，如果存在显示它的内容，不存在则创建一个文件将创建时间写入

1 #!/bin/bash
2 if [  -d "/tmp" ]; then
3 echo "/tmp is exists"
4 else
5 mkdir /tmp
6 fi
7 if [  -f "/tmp/size.log" ]; then
8 echo "size.log is exist";cat /tmp/size.log
9 else
10 touch /tmp/size.log; date > /tmp/size.log; echo "date has been successfully  written to size.log"
11 fi