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if(-f aa.txt) then 什么意思,该怎么解决

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Release： 2016-06-13 10:27:21
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if(-f aa.txt) then 什么意思
刚学 php ，xml
看别人写的程序 ，不知道什么意思 
1 if(-f aa.txt) then // 从意思看是如果aa.txt 存在就删除
那个 -f 是什么意识 
2 if （） then 
  fi // fi 是什么意思  
 

------解决方案--------------------
这是shell语法，和php没关系
-f 表示aa.txt是普通文件
fi 表示结束if逻辑

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