Re: set -F kills read -t

[Ray Andrews <rayandrews@xxxxxxxxxxx>]

On 03/19/2014 03:21 PM, Bart Schaefer wrote:
> I'm still curious what put you on to "-t" in the first place.
I was just Googling for advice on how to get a function to accept piped 
input and 'read -t'
came up several times. Monkey see, monkey do.
> Another thing you may be missing here is that "read" consumes ONE LINE
> of text:  A string ending in "\n" (or end of file).  If you do not use
> "-t", then it waits as long as it must in order to gobble up one line.
> But it won't wait for a second line.
Yes, I know that. But it's a place to start.
> (Of course you can tell it that something other than a "\n" should be
> used as a the line ending, in which case it may very well swallow
> everything up to end-of-file on the pipe, but that requires even more
> fooling around and -t has you quite well enough confused already.)
>
> }     function y ()
> }     {
> }          pipeinput='(nothing in the pipe)'
> }          terminalinput='(nothing from the terminal)'
> }          if [ ! -t 0 ];  then read pipeinput; fi
> }          if [ -n "$1" ]; then terminalinput="$@"; fi
> }          echo "$pipeinput $terminalinput"
> }     }
>
> It's a little odd to call $@ the "terminal input" -- you can have stdin
> come from a tty device the same as from any other file.  All that the
> above has said is that you never want to read from a tty, but you're
> willing to read exactly one line from anywhere else.  Consider:
>
>   $ y 'I met a man with seven wives' <<<'As I was going to St Ives'
>
> As long as your clams are happy, though ...
Now don't go confusin' me again ;-)

Hmmm ... no, you're right, it should be able to accept any volume of 
input as a matter of principal.
Ok Bart, how would you write it? The above  is a bridgehead in as much 
as it accepts input from
either end, but  how could it be improved? I tried 'cat' with no luck. 
I've already done some chains of
pipes (using binaries) up to maybe half a dozen steps, and you just 
don't have to worry about time-outs,
or single lines or anything at all, it just works, even on Tuesday.