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Weird issue with pipeviewer and multiple pipes
- X-seq: zsh-workers 38397
- From: Jason L Tibbitts III <tibbs@xxxxxxxxxxx>
- To: zsh-workers@xxxxxxx
- Subject: Weird issue with pipeviewer and multiple pipes
- Date: Tue, 03 May 2016 20:15:14 -0500
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Someone brought this up on IRC; I thought I'd bring it to a larger
audience.
Pipeviewer (pv) is a little program that sits in a pipeline, passes data
through, and outputs some progress information.
http://www.ivarch.com/programs/pv.shtml
I didn't know about it until today, but it's kind of neat. It's in most
distros/repositories/package managers/whatever.
Run this:
echo 1 | pv -l -s $(echo 1)
Should give '1' and a progress bar. Now tack on "|cat". For me that
hangs. ctrl-Z does nothing. ctrl-C seems to do what I'd expect ctrl-Z
to do:
[2] + 11459 done echo 1 |
11461 suspended (tty output) pv -l -s $(echo 1) |
11462 interrupt cat
If I type fg, the shell is pretty much hung. You have to kill -9 the pv
process either way to get rid of the job. (Lesser kills don't seem to
work.)
Could certainly be a bug in pv, but it's definitely weird and I'd just
dismiss it except that other shells seem to have no problems.
- J<
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