Date: Wed, 27 Aug 2008 02:52:22 -0400 From: Paul Chvostek <paul+fbsd@it.ca> To: DAve <dave.list@pixelhammer.com> Cc: 'User Questions' <freebsd-questions@freebsd.org> Subject: Re: Tailing logs Message-ID: <20080827065222.GA30783@it.ca> In-Reply-To: <48AECD11.1000705@pixelhammer.com> References: <48AECD11.1000705@pixelhammer.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, Aug 22, 2008 at 10:28:33AM -0400, DAve wrote:
>
> I would love to have a way to tail a log, like piping to grep, except I
> see every line and the lines I would normally grep for are highlighted.
> That would be cool. Anyone know of a bash command or tool that will do this?
I use tcsh as my shell. The following alias works nicely for me in
xterm, but would have to be adjusted for anything else:
alias highlight 'sed -E '\''s/\!:*/^[[1m&^[[0m/g'\'''
Replace "^[" with an escape character, twice. Put it in your .tcshrc if
you like. YMMV.
> Side note, I am tailing sendmail after changes to my outbound queue
> runners. I want to highlight my sm-mta-out lines but still see all lines.
Right, I do very similar stuff. You'd use this like:
tail -F /var/log/maillog | highlight .*sm-mta-out.*
Quotes seem to confound this alias. I haven't bothered to fix that; as
long as what you're searching for doesn't glob a file, you should be
fine without quotes.
You can also do more complex things in either sed or awk, colour-coding
individual pattern matches. Here's one in awk that I use to highlight
the activity of milter-greylist:
#!/usr/bin/awk -f
BEGIN {
red="^[[31m"; green="^[[32m";
yellow="^[[33m"; blue="^[[34m";
norm="^[[0m";
fmt="%s%s%s\n";
}
/autowhitelisted/ { printf(fmt, green, $0, norm); next; }
/delayed for/ { printf(fmt, yellow, $0, norm); next; }
# /skipping greylist/ { printf(fmt, blue, $0, norm); next; }
{ print; }
Same deal with the "^[".
Enjoy.
p
--
Paul Chvostek <paul@it.ca>
it.canada http://www.it.ca/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20080827065222.GA30783>