From owner-freebsd-questions@freebsd.org Mon Oct 5 04:16:13 2015 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8C2B2A10752 for ; Mon, 5 Oct 2015 04:16:13 +0000 (UTC) (envelope-from wam@hiwaay.net) Received: from fly.hiwaay.net (fly.hiwaay.net [216.180.54.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 5F3D113E5 for ; Mon, 5 Oct 2015 04:16:13 +0000 (UTC) (envelope-from wam@hiwaay.net) Received: from kabini1.local (dynamic-216-186-213-32.knology.net [216.186.213.32] (may be forged)) (authenticated bits=0) by fly.hiwaay.net (8.13.8/8.13.8/fly) with ESMTP id t954GB3J012481 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO) for ; Sun, 4 Oct 2015 23:16:12 -0500 Subject: Re: awk question To: freebsd-questions@freebsd.org References: <5611C922.4050007@hiwaay.net> <5611EEE2.9030100@sneakertech.com> From: "William A. Mahaffey III" Message-ID: <5611F98B.5060300@hiwaay.net> Date: Sun, 4 Oct 2015 23:21:41 -0453.75 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <5611EEE2.9030100@sneakertech.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Oct 2015 04:16:13 -0000 On 10/04/15 22:36, Quartz wrote: > On Oct 4 8:48 PM, William A. Mahaffey III wrote: >> >> >> I am using awk & smartctl in a small shell script to print out HDD temps >> in a purty format, 1 line per drive. As it happens, the output I want is >> spread out over 4 lines of smartctl out, requiring (I *think*) 4 calls >> to smartctl each piped to its own awk invocation to pull out the line I >> want & print its info out. Is there some way to get awk to consider more >> than 1 line at a time ? In my case my 4 lines are indeed sequential, & >> it would be a bit more efficient if I could process all 4 lines once I >> found the 1st one. This is definitely *not* critical, what I have now >> works AOK, I was/am just curious if it could be optimized a bit. TIA & >> have a good one. > > Awk already handles multiple lines just fine, so you're looking for > something else but don't know how to articulate it. > > Considering you're referring to 'pulling out lines', maybe you want to > trap the output of smartctl into a variable, then just echo that to > grep a bunch of times, before awk? > > ie; > > x=$(smartctl) > > echo "$x" | grep 'foo' | awk '{print $1}' > echo "$x" | grep 'bar' | awk '{print $2}' > echo "$x" | grep 'baz' | awk '{print $3}' > > ...etc? > > Although depending on what exactly you want to pull from the smartctl > output, you can probably just do it all from awk in one incantation. > Awk scripts can be fairly powerful. I missed that 1st point somehow (relatively new to using awk :-/ ), so that is indeed all I need to know how to do. Polytropon provided exactly the guidance I need (I *think*) & I will try that out on the morrow. Thanks & have a good one :-) .... -- William A. Mahaffey III ---------------------------------------------------------------------- "The M1 Garand is without doubt the finest implement of war ever devised by man." -- Gen. George S. Patton Jr.