X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=date:from:to:subject:message-id:in-reply-to:references:mime-version
         :content-transfer-encoding;
        bh=Gj/VzylqHtGN2VBmru4pDePWdsEtA752g6W12FKbn7c=;
        b=NKbgyosXueHC3NoaqVtpFOfLwTbeF/gB6fUEsPp0uPClxw8gAGIwpBHxKBggWMoV6O
         Iq14avf7fzlmTEYpKyPFX2t2RMIphWVpi4v67b09p8xKU7mmbKWAn/9QPBExprGyu4sV
         LFOUbOFN4N8TL0in3T3EhXUTw4iqQ5rN06EbLkjHbTezGv3aD7XO6SlelYpj7tFQFcWf
         S9yrqZr+bVZ6HDXPIxvjhPYh30EmP+Yl9rRwKVn9pfBzGKIkpkQb+6u3pvaNBXxQu6Ph
         X43HTgbB6E56vY2mvzD+25F+mFBEmn3zItIf/yfc7a49VNttbfazr+rKyWSaBe3F8oo6
         zSgA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20130820;
        h=x-gm-message-state:date:from:to:subject:message-id:in-reply-to
         :references:mime-version:content-transfer-encoding;
        bh=Gj/VzylqHtGN2VBmru4pDePWdsEtA752g6W12FKbn7c=;
        b=b4BlZBgwQRu0HWjjnibP1qNpK9qxiGUBk3L0Sz2w24go2Nr4JP0IinP+TLck6EIo9F
         ZqRJT6get0tF+swAdAt85tEZ8OSBB+LX/Vn7pZZsEUzJwOwzh2WodCpbNRp66Sv041pG
         QP8nLqtFPZgtVxp/aGVm2F2eAlFrD/v8Ak3uuUpyFoQdxxtPRY5JiXGJor3+ynERAwI0
         nv4P8nuXOeHZmIQlnX9IackO4Y+mqvTTboqmd2d4IidEEetmBr/C2FsVQGmPZBPC9RM2
         MdoMKgg7j0zLsUNyR+u7ujqke9AdwFeYMA6fzDqTbsOLBbjUHbpd7Q2RbpbMQ/YyjkL9
         F0zw==
X-Gm-Message-State: AOPr4FX3iWVZ7xPiHHArkNAm2zay0cWLZKnAPGRHM4l9OMWMrTr8Ke1Jt5EMtdys1k6n/A==
X-Received: by 10.28.216.76 with SMTP id p73mr1814974wmg.3.1461909689986;
        Thu, 28 Apr 2016 23:01:29 -0700 (PDT)
Date: Fri, 29 Apr 2016 08:01:28 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] modifying the width of a group of tracks in pcb
Message-Id: <20160429080128.91f676a64d00a567a0ea9ac1@gmail.com>
In-Reply-To: <188AA225-D025-42A2-B798-72B46BCB5916@wellesley.edu>
References: <188AA225-D025-42A2-B798-72B46BCB5916 AT wellesley DOT edu>
X-Mailer: Sylpheed 3.5.0beta1 (GTK+ 2.24.25; x86_64-pc-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

> I designed a board with some 50 ohm microstrip tracks, whose widths (13.5mil) were chosen for a particular board house.  I now need to use a different board house, with a different dielectric and prepreg thickness, and so will need to change the widths of all of my 50ohm tracks.
> 
> Many tracks in my layout are also 13.5 mil wide even though they are not meant to be controlled impedance runs.  I’d like to leave these alone and only modify the width of the 50ohm runs. For future boards, I’ll definitely only use the 50ohm trace width for 50ohm traces, in which case a straight sed search/replace will do what I need.  But in the meantime, any recommendations for doing a batch modification of the trace width of a group of selected traces?  
> 
> Thank you,
> James

Another options would be to modify pcb so you can do the change. I guess trace width are an attribute and with gschem style attribute editing it would be possible to change them all at once.