"Tailing" grep (Was: cat and grep without destroying file)
Brian Fahrlander
brian at fahrlander.net
Mon Oct 1 00:37:46 UTC 2007
Michael R. Head wrote:
> On Sun, 2007-09-30 at 17:04 -0500, Brian Fahrlander wrote:
>> While we've got the attention of the most-able on this subject, I'd
>> like to reopen a discussion about a very similar tool: a 'grep' that
>> happens on tailing a file. There have been dozens of times that I'm
>> looking for a message number in /var/log/mail.log and would love to see
>> only the lines mentioning that message.
>>
>> A couple of years ago I asked and got a "maybe you could write
>> something", but I actually never could. It's not as easy as it looks.
>>
>> Any chance you guys have seen this done?
>
> You can use the "watch" program to effectively achieve this
> functionality.
>
> watch "grep kernel /var/log/syslog | tail -n 20"
Thanks; I'll look into that!
--
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Brian Fahrländer Christian, Conservative, and Technomad
Evansville, IN http://Fahrlander.net/brian
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