[cs631apue] how to check the file extension

[bzhang41]

Sorry, I just found the function mentioned in the manual page.

On 2016-11-08 10:45, bzhang41 wrote:
> Dear Prof.
> 
> Last class I asked you about how to check the file extension for the
> "Content-Type" header, and you suggested a library function which will
> return the file extension. But I accidentally delete my class note
> when I try "1>mynote" on the terminal, I wanted to try "1>>mynote".
> So I lost my notes and forgot what that function is, can you tell me 
> again ?
> I googled quite a while, but I cannot find the function you tole me.
> 
> Thanks
> Bo