the first :
 

hello,everyone.I want to ask a question.
getopt(argc,argv,":if:lr").
I have seen the samle.But mainly the second :
I want to ask the first : meaning what?
Thank you very much!

Yes..meaning WHAT? Can't really understand your question...

What version/distro of Linux? What programming language are you using in this instance?

c programming language...
the ":" in the function getopt(argc,argv,":if:lr");
I have know the second ":" in the function getopt
but I don't know the first ":" in the function.
Thank you very much...

up anyone know the answer?

I'm not sure anyone understands the question.

You've posted in Linux > Newbie but you question is not about Linux, it is as you say, about the C programming language. You might be using Linux but you could be using any operating system and you would still be asking a question about C, not about the operating system you are using.
There's a programming section at http://www.linuxquestions.org/questions/programming-9/
Or maybe you'd get help at somewhere like
http://forums.devshed.com/c-programming-42/
http://cboard.cprogramming.com/

I think the OP is asking what does the first ":" mean in the argument optstring ":if:lr".

http://opengroup.org/onlinepubs/0096...ns/getopt.html

It's very rude to bump your thread, especially less than 24 hours apart, bugging people to give you an answer.

If it's that urgent, check Google....