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Groups > comp.unix.programmer > #614
| Newsgroups | comp.unix.programmer |
|---|---|
| From | Geoff Clare <geoff@clare.See-My-Signature.invalid> |
| Subject | Re: Tail -f with filter question |
| References | <4dd23b73$0$25748$c3e8da3$33881b6a@news.astraweb.com> <iqtguv$ef8$3@dont-email.me> |
| Date | 2011-05-18 13:22 +0100 |
| Message-ID | <2aqca8-jps.ln1@leafnode-msgid.gclare.org.uk> (permalink) |
| Organization | Zen Internet |
Tobias Blass wrote: > On 2011-05-17, Matt Charles <mcharles48@gmail.com> wrote: >> >> I've tried this: >> >> tail -f log.txt | grep -v INFO >> >> but I think that's buffering and I don't get to see the error messages >> when they are produced (in real time). > > I found the following option for grep >> --line-buffered Use line buffering on output. This can cause a >> performance penalty. > I guess grep uses block buffering by default, so line buffering should solve > your problem The buffering is being done in tail, not grep. The solutions given by others involve running tail with its output going to a pseudo-terminal, using a tool that will read that output from the master side of the pseudo-terminal and write it (without buffering) to the pipe. -- Geoff Clare <netnews@gclare.org.uk>
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Tail -f with filter question Matt Charles <mcharles48@gmail.com> - 2011-05-17 10:09 +0100
Re: Tail -f with filter question pk <pk@pk.invalid> - 2011-05-17 10:27 +0100
Re: Tail -f with filter question Mc <spam.mc@gmail.com> - 2011-05-17 10:55 +0100
Re: Tail -f with filter question pk <pk@pk.invalid> - 2011-05-17 11:04 +0100
Re: Tail -f with filter question Tobias Blass <tobiasblass@gmx.net> - 2011-05-17 09:59 +0000
Re: Tail -f with filter question scott@slp53.sl.home (Scott Lurndal) - 2011-05-17 14:08 +0000
Re: Tail -f with filter question Nobody <nobody@nowhere.com> - 2011-05-18 07:55 +0100
Re: Tail -f with filter question Geoff Clare <geoff@clare.See-My-Signature.invalid> - 2011-05-18 13:22 +0100
Re: Tail -f with filter question Damien Wyart <damien.wyart@free.fr> - 2011-05-17 16:36 +0200
Re: Tail -f with filter question James Waldby <not@valid.invalid> - 2011-05-17 18:22 +0000
Re: Tail -f with filter question Damien Wyart <damien.wyart@free.fr> - 2011-05-17 22:01 +0200
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