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From: davidsen@sungod.crd.ge.com (William Davidsen)
Newsgroups: comp.unix.wizards
Subject: Re: Examples of multiple stream shell scripts
Keywords: multiple streams, parallel pipes
Message-ID: <671@crdgw1.crd.ge.com>
Date: 7 Jun 89 19:56:03 GMT
References: <258@ethz-inf.UUCP>
Sender: news@crdgw1.crd.ge.com
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric Corp. R&D, Schenectady, NY
Lines: 27

In article <258@ethz-inf.UUCP> wyle@inf.ethz.ch writes:

| Consider the following pipleline:
| 
| 
|                cos2
|              /     \
|             /       \
| cos1 < file           cos4 |  cos5 > report 
|             \       /       /
|              \     /       /
|                cos3 -------
| 
| 
| where the output of cos2 and cos3 are join(1)ed to form the input to
| cos4; the output of cos4 and cos3 are joined again for cos5.
| 
| Can tee(1) send output to multiple *streams* (not files)?  
| What about named pipes?

You have it. But what are you doing in cos5? Reading both streams at
once?? You can do them consecutively with cat, but not really mix them.
Well, maybe with a FIFO if you flushed the buffers, but I wouldn't like
to count on it.
	bill davidsen		(davidsen@crdos1.crd.GE.COM)
  {uunet | philabs}!crdgw1!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me