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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.acm.org>
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Subject: Re: Defaulting to Standard_Output
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deadlyhead wrote:
> 
> This is not what I want.  I want all output of the program to go to
> Standard_Output if no name is given for Outfile.  It's like if `cat`
> had an option '-o' that designated an output file.  `cat something.txt
> -o outfile.txt` = `cat something.txt > outfile.txt`, but `cat
> something.txt` outputs to the terminal.  That's the type of
> functionality that I want.

It works like this:

if File_Name /= "" then
    Create (File);
    Set_Output (File);
end if;

-- call Put, Put_Line, and New_Line without a File parameter

if File_Name /= "" then
    Close (File);
end if;

If the user specifies a file, then output goes to that file. If he doesn't, then 
output goes to Standard_Output.

-- 
Jeff Carter
"When danger reared its ugly head, he bravely
turned his tail and fled."
Monty Python and the Holy Grail
60