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Article #1149Re: pipe equivalent to /dev/null ???
From: Dave Eisen
Date: Sat, 15 Sep 1990 19:37
Date: Sat, 15 Sep 1990 19:37
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1603 bytes
In article <1990Sep11.013805.3594@chinet.chi.il.us> les@chinet.chi.il.us (Leslie Mikesell) writes: >In article <8720002@hpdmd48.boi.hp.com> oscarh@hpdmd48.boi.hp.com (Oscar Herrera) writes: > >> Well, I found the answer to my own question. >> touch bitbucket >> chmod +x bitbucket >> ll | bitbucket > >This will work only so long as the process generating the output doesn't >generate enough data to fill a pipe buffer. Since your "null" program >isn't actually going to read anything, when the pipe fills, the writing >program will block. Small nit. As you said, there is a problem with the pipe buffer filling and the write hanging. More serious though is the problem that when bitbucket runs and dies, any subsequent write by ll will result in ll receiving a SIGPIPE (write to a pipe with no reader) signal and presumably being killed. -- Dave Eisen Home: (415) 323-9757 dkeisen@Gang-of-Four.Stanford.EDU Office: (415) 967-5644 1447 N. Shoreline Blvd. Mountain View, CA 94043
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uwm.edu!bionet!agate!shelby!neon!Gang-of-Four!dkeisen From: dkeisen@Gang-of-Four.Stanford.EDU (Dave Eisen) Newsgroups: comp.unix.shell Subject: Re: pipe equivalent to /dev/null ??? Message-ID: <1990Sep15.193724.26273@Neon.Stanford.EDU> Date: 15 Sep 90 19:37:24 GMT References: <8720001@hpdmd48.boi.hp.com> <8720002@hpdmd48.boi.hp.com> <1990Sep11.013805.3594@chinet.chi.il.us> Sender: news@Neon.Stanford.EDU (USENET News System) Organization: Sequoia Peripherals Lines: 23