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What does if(-faa.txt) then mean? how can this problem be solved?

Source: Internet
Author: User
Tags faa
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(Optional) then // in consideration, if aa.txt exists, delete the-f awareness. & nbsp; 2if () then & nbs if (-f aa.txt) then.
Php and xml
I don't know what it means to look at programs written by others.
1 if (-f aa.txt) then // you may want to delete it if aa.txt exists.
What is that-f awareness?
2 if () then
Fi // What does fi mean?


------ Solution --------------------
This is the shell syntax. it has nothing to do with php.
-F aa.txt is a common file.
Fi indicates end of if logic

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