Tim.Evans@f112.n138.z1.WA.COM (Tim Evans) (07/04/89)
I would like to 'peek' in on a pipe, to see what is happening in it, WHILE
IT EXECUTES. I tried something like this, but no luck:
some_stuff | tee `tty` | more_stuff
I would like to do this while it executes, not tee to a file and see it
later. Does anyone have any ideas how this might be done?
Thanks,
...Tim
--
///////////////////////////////////////////////////////////////////
- BBS phone no. +1 (206) 822-4615 FidoNet 1:343/15 Kirkland,WA USA
- UUCP uunet!nwnevus!seaeast
uw-beaver!thebes!camco!happym!rwing!seaeast
- INTERNET seaeast.WA.COM
///////////////////////////////////////////////////////////////////maart@cs.vu.nl (Maarten Litmaath) (07/08/89)
Tim.Evans@f112.n138.z1.WA.COM (Tim Evans) writes:
\I would like to 'peek' in on a pipe, to see what is happening in it, WHILE
\IT EXECUTES. I tried something like this, but no luck:
\
\ some_stuff | tee `tty` | more_stuff
\
\I would like to do this while it executes, not tee to a file and see it
\later. Does anyone have any ideas how this might be done?
This is funny!
Did you ever ls(1) your directory after issuing the pipeline command above?
I bet you'd find three files you didn't expect:
a
not
tty
stdin of the `tty` command is a pipe, hence the message "not a tty", so
tee(1) sees 3 `filenames' to duplicate stdout to!
Solution:
foobie | tee /dev/tty | bletch
--
"... a lap-top Cray-2 with builtin |Maarten Litmaath @ VU Amsterdam:
cold fusion power supply" (Colin Dente) |maart@cs.vu.nl, mcvax!botter!maartmvp@v7fs1.UUCP (Mike Van Pelt) (07/11/89)
>Tim.Evans@f112.n138.z1.WA.COM (Tim Evans) writes: >I would like to 'peek' in on a pipe, to see what is happening in it, WHILE >IT EXECUTES. I tried something like this, but no luck: > > some_stuff | tee `tty` | more_stuff Here's what I do -- I'm assuming you want to just peek in on it from time to time, not look at the whole thing. some_stuff | tee bletch | more stuff Then, if I want to check in on what's going through the tee I just tail bletch, or, if I want to monitor it for a while, tail -f bletch. -- Mike Van Pelt "I'm not a biologist, but I play one in Headland Technology/Video 7 front of Congressional hearings." ...ames!vsi1!v7fs1!mvp -- Meryl Streep
rey@safn2.UUCP (Reynolds McClatchey) (07/12/89)
In article <6.24B47361@seaeast.WA.COM>, Tim.Evans@f112.n138.z1.WA.COM (Tim Evans) writes: > I would like to 'peek' in on a pipe, to see what is happening in it, WHILE > IT EXECUTES. I tried something like this, but no luck: > > some_stuff | tee `tty` | more_stuff See Unix World Sept 87 for branch & combine C source by Brian Keen. They enable you to pump into or tap out of a pipe. I've found them useful. Reynolds McClatchey uunet!safn2!rey
mcs@atux01.UUCP (M. Sabanos) (07/12/89)
In article <6.24B47361@seaeast.WA.COM>, Tim.Evans@f112.n138.z1.WA.COM (Tim Evans) writes: > I would like to 'peek' in on a pipe, to see what is happening in it, WHILE > IT EXECUTES. I tried something like this, but no luck: > > some_stuff | tee `tty` | more_stuff > > I would like to do this while it executes, not tee to a file and see it > later. Does anyone have any ideas how this might be done? Try this instead: some_stuff | tee /dev/tty | more_stuff > Thanks, > ...Tim Your welcome, Mike Sabanos
mre@beatnix.UUCP (Mike Eisler) (07/14/89)
In article <6.24B47361@seaeast.WA.COM>, Tim.Evans@f112.n138.z1.WA.COM (Tim Evans) writes: > I would like to 'peek' in on a pipe, to see what is happening in it, WHILE > IT EXECUTES. I tried something like this, but no luck: > > some_stuff | tee `tty` | more_stuff Try some_stuff | tee /dev/tty | more_stuff ... | tee `tty` | more_stuff fails because tty(1) calls ttyname(3) to find terminal name with file descriptor 0 as its argument. Fd 0 is a pipe when tee is used inside a pipeline. uunet!elxsi!mre