shell判斷文件/目錄是否存在

https://www.cnblogs.com/37yan/p/6962563.html

 

caution!!! if should be end with fi

 

caution!!! there should be a space between [ and ! , also between 1 and ]

if [ ! $# -eq 1 ];then

#!/bin/bash
# 判斷傳入的參數的個數是不是一個
if [ ! $# -eq 1  ];then
  echo param error!
  exit 1
fi

# 判斷目錄是不是已經存在，如果不存在則創建，存在則輸出“dir exist” 
dirname=$1
echo "the dir name is $dirname"
if [ ! -d $dirname  ];then
  mkdir $dirname
else
  echo dir exist
fi