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From: =?UTF-8?B?SGFucy1CZXJuaGFyZCBCcsO2a2Vy?= <HBBroeker@t-online.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: "test.gnu", line 1: Unrecognized option.  See 'help set'.
Date: Fri, 22 Jul 2011 09:25:34 +0200
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Xref: x330-a1.tempe.blueboxinc.net comp.graphics.apps.gnuplot:464

On 22.07.2011 05:21, Hongyi Zhao wrote:
> $ gnuplot test.gnu
>
> set data style lines
>      ^
> "test.gnu", line 1: Unrecognized option.  See 'help set'.
> -----------

Your script is several versions of gnuplot out of date.  You'll have to 
update it to the current version's syntax.  See "help set", in 
particular "help set style".