Shell File/dir exist

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

CAUTION!!! If should is end with fi

CAUTION!!! There should be a space between [and!, also between 1 and]

1  ];then

#!/bin/bash# Determine if the number of parameters passed in is not an if1  ];then  echo param error!    1 fi# Determine if the directory is already present, if it does not exist then create, then output "dir exist" DirName=$1"thedir name is $ DirName"if [! -D $dirname  ];then  mkdir $dirnameelse  echo dir existfi

Shell File/dir exist