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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!cpk-news-hub1.bbnplanet.com!cam-news-hub1.bbnplanet.com!news.bbnplanet.com!howland.erols.net!newsfeed.internetmci.com!uuneo.neosoft.com!dolphin.neosoft.com!nobody From: conrads@neosoft.com (Conrad Sabatier) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Thanks (was Re: A shell oddity (bug?)) Date: Thu, 13 Mar 1997 23:49:46 -0600 Organization: NeoSoft, Inc. Lines: 26 Message-ID: <qtoag5.cdi.ln@dolphin.neosoft.com> References: <jpt2g5.q2c.ln@dolphin.neosoft.com> Reply-To: conrads@neosoft.com NNTP-Posting-Host: 206.27.167.0 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Newsreader: knews 0.9.8 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:36998 In article <jpt2g5.q2c.ln@dolphin.neosoft.com>, conrads@neosoft.com (Conrad Sabatier) writes: Thanks to all who followed up on this. And a special thanks for not jumping on me for my cluelessness. :-) Obviously, my understanding of the pipe mechanism left much to be desired. > ps -xU news | grep fetch > > Assuming there's a running /usr/local/sbin/fetch (part of the > leafnode package), then all one *should* see as a result would be: > > <PID> .... /usr/local/sbin/fetch > > However, sometimes the "grep fetch" itself also appears in the > output! > > This makes no sense to me. Grep should be receiving the piped > output of ps taken from *before* grep was running. > > Why does this happen? -- Conrad Sabatier http://www.neosoft.com/~conrads