How to get input from a file to come from output of a process?

How to get input from a file to come from output of a process?

Post by Joel M. Hoffm » Tue, 07 Apr 1992 11:09:22



Is this possible:  I'd like any process that opens a certain file for
reading to get the output of another process.  For example, any
process opening ~/.plan would get the output of " rwho | grep `whoami` ".
That is, the command " cat < foo " should be linked somehow to
"bar | cat" for any foo and bar that I choose.

Is there a general solution to this problem?

-Joel

 
 
 

How to get input from a file to come from output of a process?

Post by Jonathan I. Kame » Tue, 07 Apr 1992 23:48:13


If your system supports FIFOs, then you can create a FIFO, have a
program open it and write to it, and then have other programs open it
to read from it.

See the man page(s) for mknod to find out if FIFOs are supported on
your system.

There are several examples of this in the alt.sources archives.
Search in the index for the words "plan" or "FIFO" in order to find
them.

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1. background process runs and output comes to terminal in 4.3.3

Running an AIX using class and had students do a
ls -R / &
This should have stopped almost instantly as ls tried to write to terminal.
Instead, ls spilled its guts out.

Found that stty had terminal output stop option off. (that is, stty -tostop)
This is not the posix standard.  Has anybody else run into this (4.3.2 works properly).
Is this a bug?  Or should I check more and see if somebody decided to override a default
setting?
--
Norman Levin

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