Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Workers List List-Post: List-Help: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.1 From: Jason L Tibbitts III To: zsh-workers@zsh.org Subject: Weird issue with pipeviewer and multiple pipes Date: Tue, 03 May 2016 20:15:14 -0500 Message-ID: User-Agent: Gnus/5.130014 (Ma Gnus v0.14) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Seq: zsh-workers 38397 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<