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		<title>bloco de notas</title>
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		<item>
		<title>10 anos de NDVI e de deteção de incêndios do instrumento MODIS.</title>
		<link>http://eloiribeiro.wordpress.com/2011/10/26/10-anos-de-ndvi-e-de-detecao-de-incendios-do-instrumento-modis/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/10/26/10-anos-de-ndvi-e-de-detecao-de-incendios-do-instrumento-modis/#comments</comments>
		<pubDate>Wed, 26 Oct 2011 07:44:22 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[ciencia]]></category>
		<category><![CDATA[ecologia]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=759</guid>
		<description><![CDATA[Uma visualização espetacular realizada pela NASA com os dados de indice de vegetação (NDVI) e de deteção de incêndios adquiridos pelo instrumento MODIS a bordo dos satélites Terra e Aqua nos últimos 10 anos (Julho de 2002 a Julho de 2011). Fonte: NASA/Goddard Space Flight Center Scientific Visualization Studio<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=759&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Uma visualização espetacular realizada pela NASA com os dados de indice de vegetação (NDVI) e de deteção de incêndios adquiridos pelo instrumento MODIS a bordo dos satélites Terra e Aqua nos últimos 10 anos (Julho de 2002 a Julho de 2011).</p>
<p><object width="500" height="281"><param name="movie" value="http://www.youtube.com/v/YnocXTq5IVU?version=3&#038;feature=oembed"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/YnocXTq5IVU?version=3&#038;feature=oembed" type="application/x-shockwave-flash" width="500" height="281" allowscriptaccess="always" allowfullscreen="true"></embed></object></p>
<p>Fonte: <a href="http://svs.gsfc.nasa.gov/vis/a000000/a003800/a003868/index.html">NASA/Goddard Space Flight Center Scientific Visualization Studio</a> </p>
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		<geo:long>-0.376805</geo:long>
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			<media:title type="html">Eloi</media:title>
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	</item>
		<item>
		<title>Gravar video com a webcam no Ubuntu</title>
		<link>http://eloiribeiro.wordpress.com/2011/10/04/gravar-video-com-a-webcam-no-ubuntu/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/10/04/gravar-video-com-a-webcam-no-ubuntu/#comments</comments>
		<pubDate>Tue, 04 Oct 2011 19:06:21 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[informatica]]></category>
		<category><![CDATA[linux]]></category>
		<category><![CDATA[ubuntu]]></category>
		<category><![CDATA[video]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=752</guid>
		<description><![CDATA[Para gravar um video (com som) com a webcam basta escrever a seguinte instrução na linha de comandos.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=752&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Para gravar um video (com som) com a webcam basta escrever a seguinte instrução na linha de comandos.<br />
<pre class="brush: bash;">
ffmpeg -f oss -i /dev/dsp -f video4linux2 -s 640x480 -i /dev/video0 out.mpg
</pre></p>
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			<media:title type="html">Eloi</media:title>
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	</item>
		<item>
		<title>Conversão entre formatos de video</title>
		<link>http://eloiribeiro.wordpress.com/2011/05/23/conversao-entre-formatos-de-video/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/05/23/conversao-entre-formatos-de-video/#comments</comments>
		<pubDate>Mon, 23 May 2011 20:08:34 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[informatica]]></category>
		<category><![CDATA[video]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=719</guid>
		<description><![CDATA[ou<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=719&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><pre class="brush: bash;">
mencoder -idx input.ogv -ovc lavc -oac mp3lame -o output.avi
</pre><br />
ou<br />
<pre class="brush: bash;">
ffmpeg -i input.ogv output.mpg
</pre></p>
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		<georss:point>39.470239 -0.376805</georss:point>
		<geo:lat>39.470239</geo:lat>
		<geo:long>-0.376805</geo:long>
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			<media:title type="html">Eloi</media:title>
		</media:content>
	</item>
		<item>
		<title>Conversão de graus a metros</title>
		<link>http://eloiribeiro.wordpress.com/2011/05/23/conversao-de-graus-a-metros/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/05/23/conversao-de-graus-a-metros/#comments</comments>
		<pubDate>Mon, 23 May 2011 08:44:39 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[postgis]]></category>
		<category><![CDATA[postgresql]]></category>
		<category><![CDATA[sig]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=699</guid>
		<description><![CDATA[Um método simples e bastante preciso para converter graus a metros é conseguido utilizando uma consulta SQL em PostgreSQL + PostGIS. Como podemos ver nas seguintes consultas para distintas latitudes:<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=699&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Um método simples e bastante preciso para converter graus a metros é conseguido utilizando uma consulta SQL em PostgreSQL + PostGIS. Como podemos ver nas seguintes consultas para distintas latitudes:</p>
<p><pre class="brush: sql;">
-- A quantos metros corresponde 1º no equador?
SELECT ST_Length( ST_Transform( ST_MakeLine( ST_SetSRID( ST_MakePoint(0,0),4326), ST_SetSRID( ST_MakePoint(-1,0),4326)),2040));
-- Resultado: 111382.856467237 metros = 111 Km aprox.

-- A quantos metros corresponde 1º em Valencia (39º lat)?
SELECT ST_Length( ST_Transform( ST_MakeLine( ST_SetSRID( ST_MakePoint(0,39),4326), ST_SetSRID( ST_MakePoint(-1,39),4326)),23030));
-- Resultado: 86641.9022522006 metros = 86,6 Km aprox.
</pre></p>
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		<geo:lat>39.470239</geo:lat>
		<geo:long>-0.376805</geo:long>
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			<media:title type="html">Eloi</media:title>
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		<item>
		<title>Como instalar o Firefox 4 no Ubuntu 10.04</title>
		<link>http://eloiribeiro.wordpress.com/2011/05/10/como-instalar-firefox-4-no-ubuntu-10-04/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/05/10/como-instalar-firefox-4-no-ubuntu-10-04/#comments</comments>
		<pubDate>Tue, 10 May 2011 15:03:00 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[informatica]]></category>
		<category><![CDATA[internet]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=693</guid>
		<description><![CDATA[Suponho que para versões mais recentes de Ubuntu seja o mesmo. Abrir o Firefox e por o seguinte &#8216;about:config&#8217;. Filtrar por &#8216;webgl.osmesalib&#8217;. Duplo click e introduzir &#8216;/usr/lib/libOSMesa.so.6&#8242;. Reiniciar Firefox.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=693&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Suponho que para versões mais recentes de Ubuntu seja o mesmo.</p>
<p><pre class="brush: bash;">
# Adicionar o repositório de Firefox para termos sempre a versão mais atual.
sudo add-apt-repository ppa:mozillateam/firefox-stable

# Atualizar o sistema e o firefox.
sudo apt-get update &amp;&amp; sudo apt-get upgrade

# Habilitar WebGL
sudo apt-get install libosmesa6
</pre></p>
<p>Abrir o Firefox e por o seguinte &#8216;about:config&#8217;.<br />
Filtrar por &#8216;webgl.osmesalib&#8217;.<br />
Duplo click e introduzir &#8216;/usr/lib/libOSMesa.so.6&#8242;.<br />
Reiniciar Firefox.</p>
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			<media:title type="html">Eloi</media:title>
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		<title>Parabéns Linux</title>
		<link>http://eloiribeiro.wordpress.com/2011/04/08/parabens-linux/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/04/08/parabens-linux/#comments</comments>
		<pubDate>Fri, 08 Apr 2011 07:08:03 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[linux]]></category>
		<category><![CDATA[video]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=686</guid>
		<description><![CDATA[Em 2011, Linux faz 20 anos. Este é o vídeo comemorativo realizado pela The Linux Foundation.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=686&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Em 2011, Linux faz 20 anos. Este é o vídeo comemorativo realizado pela <a href="http://www.linuxfoundation.org/">The Linux Foundation</a>.<br />
<span style="text-align:center; display: block;"><a href="http://eloiribeiro.wordpress.com/2011/04/08/parabens-linux/"><img src="http://img.youtube.com/vi/5ocq6_3-nEw/2.jpg" alt="" /></a></span></p>
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		<georss:point>39.470239 -0.376805</georss:point>
		<geo:lat>39.470239</geo:lat>
		<geo:long>-0.376805</geo:long>
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			<media:title type="html">Eloi</media:title>
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	</item>
		<item>
		<title>Esta manhã na &#8220;Marjal del Moro&#8221;.</title>
		<link>http://eloiribeiro.wordpress.com/2011/02/20/esta-manha-na-marjal-del-moro/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/02/20/esta-manha-na-marjal-del-moro/#comments</comments>
		<pubDate>Sun, 20 Feb 2011 14:11:06 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[birdwatching]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=674</guid>
		<description><![CDATA[Quando já estávamos a terminar o passeio vimos este bando de 124 flamingos à procura de um sitio para se instalarem na &#8220;Marjal del Moro&#8220;.<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=674&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Quando já estávamos a terminar o <a href="https://picasaweb.google.com/lh/photo/jbdASqDtI4FV2OHHOvCwyg?feat=directlink">passeio</a> vimos este bando de 124 <a href="http://pt.wikipedia.org/wiki/Flamingo-comum">flamingos</a> à procura de um sitio para se instalarem na &#8220;<a href="http://es.wikipedia.org/wiki/Marjal_del_moro">Marjal del Moro</a>&#8220;.</p>
<p style="text-align:center;"><a href="https://picasaweb.google.com/lh/photo/vRLt3tloqOszo8zoJ4nhnA?feat=directlink"><img src="https://lh6.googleusercontent.com/_B9uNfpvjwAI/TWEcY9ZZ4WI/AAAAAAAAH9A/_G7iJB-MpYQ/s400/2011-02-20-12-54-14.jpg" alt="" /></a></p>
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		<slash:comments>0</slash:comments>
		<georss:point>39.470239 -0.376805</georss:point>
		<geo:lat>39.470239</geo:lat>
		<geo:long>-0.376805</geo:long>
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			<media:title type="html">Eloi</media:title>
		</media:content>

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	</item>
		<item>
		<title>Etiquetar geometrias de parte simples poligonais em PostGIS</title>
		<link>http://eloiribeiro.wordpress.com/2011/02/02/etiquetar-geometrias-de-parte-simples-poligonais-em-postgis/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/02/02/etiquetar-geometrias-de-parte-simples-poligonais-em-postgis/#comments</comments>
		<pubDate>Wed, 02 Feb 2011 09:19:58 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[postgis]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=658</guid>
		<description><![CDATA[Se temos um tema com geometrias de parte simples (single part) poligonais, como por exemplo o tema países. Ao etiquetar surgirá uma etiqueta por cada elemento geométrico quando queremos apenas uma etiqueta para todos os elementos pertencentes ao mesmo grupo, neste caso país. Antes. Esta foi uma solução simples e rápida que encontrei. Criar um [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=658&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Se temos um tema com geometrias de parte simples (<em>single part</em>) poligonais, como por exemplo o tema países. Ao etiquetar surgirá uma etiqueta por cada elemento geométrico quando queremos apenas uma etiqueta para todos os elementos pertencentes ao mesmo grupo, neste caso país.</p>
<p style="text-align:center;"><a><img src="https://lh3.googleusercontent.com/_B9uNfpvjwAI/TUkZI1tSBTI/AAAAAAAAH8Y/sfaXbR05bxM/s640/etiqueta_mal.png" height="291" width="400" /></a></p>
<p>Antes.</p>
<p>Esta foi uma solução simples e rápida que encontrei. Criar um novo campo com geometria para pontos e ai calcular o centroide da geometria poligonoal com maior superfície do grupo, neste caso país. Código SQL:</p>
<p><pre class="brush: sql;">
SELECT AddGeometryColumn('sch_cartobase', 'wd_paises', 'geom_label', 4326, 'POINT', 2);

UPDATE sch_cartobase.wd_paises 
	SET geom_label = SetSRID(MakePoint((ST_X(ST_Centroid(geom))),(ST_Y(ST_Centroid(geom)))), 4326) 
	WHERE ST_Area(geom) 
		IN (SELECT max(ST_Area(geom)) 
		    FROM sch_cartobase.wd_paises 
		    GROUP BY iso3166_2);
</pre></p>
<p>Agora para o mesmo tema existem duas geometrias, uma poligonal e outra de pontos, esta ultima servirá apenas para etiquetar.</p>
<p style="text-align:center;"><a><img src="https://lh3.googleusercontent.com/_B9uNfpvjwAI/TUkZH6mqXrI/AAAAAAAAH8U/J2u4oSVwlNI/s640/etiqueta_bem.png" height="291" width="400" /></a></p>
<p>Depois.</p>
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		<georss:point>39.470239 -0.376805</georss:point>
		<geo:lat>39.470239</geo:lat>
		<geo:long>-0.376805</geo:long>
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			<media:title type="html">Eloi</media:title>
		</media:content>

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		<item>
		<title>Minimizar Evolution para a barra de tarefas</title>
		<link>http://eloiribeiro.wordpress.com/2011/01/19/minimizar-evolution-para-a-barra-de-tarefas/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/01/19/minimizar-evolution-para-a-barra-de-tarefas/#comments</comments>
		<pubDate>Wed, 19 Jan 2011 06:00:02 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[internet]]></category>
		<category><![CDATA[ubuntu]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=579</guid>
		<description><![CDATA[Uma das coisas que me irrita acerca do Evolution é o facto de não se minimizar na barra de tarefas. Com devilspie podemos forçar esta acção. Para tal devemos seguir os seguintes passos, substituindo &#8216;eloi&#8217; pelo nome do utilizador: Instalar devilspie e criar uma pasta para guardar os seus ficheiros. Criar o ficheiro evolution.ds. Executar [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=579&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Uma das coisas que me irrita acerca do <em>Evolution</em> é o facto de não se minimizar na barra de tarefas. Com <em>devilspie</em> podemos forçar esta acção.</p>
<p>Para tal devemos seguir os seguintes passos, substituindo &#8216;eloi&#8217; pelo nome do utilizador:<br />
Instalar <em>devilspie</em> e criar uma pasta para guardar os seus ficheiros.</p>
<p><pre class="brush: bash;">
sudo apt-get install devilspie
mkdir /home/eloi/.devilspie
</pre></p>
<p>Criar o ficheiro <em>evolution.ds</em>. Executar a seguinte instrução na mesma linha.</p>
<p><pre class="brush: bash;">
echo '(if(matches(window_name)&quot;.+Evolution$&quot;)(begin(println&quot;--[ Evolution ]--&quot;)(pin)(skip_tasklist)(minimize)))' &gt; /home/eloi/.devilspie/evolution.ds
</pre></p>
<p>Arrancar <em>devilspie</em>.</p>
<p><pre class="brush: bash;">
devilspie -d
</pre></p>
<p>Já está a funcionar. Agora falta adicionar <em>devilspie</em> ao arranque do sistema para que não seja necessário executar-lo manualmente cada vez que iniciamos a sessão.</p>
<p><pre class="brush: bash;">
sudo echo '[Desktop Entry]
Type=Application
Exec=devilspie
Hidden=false
NoDisplay=false
X-GNOME-Autostart-enabled=true
Name=devilspie
Comment=Minimiza programas para a barra de tarefas' &gt; /home/eloi/.config/autostart/devilspie.desktop
</pre></p>
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		<georss:point>39.470239 -0.376805</georss:point>
		<geo:lat>39.470239</geo:lat>
		<geo:long>-0.376805</geo:long>
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			<media:title type="html">Eloi</media:title>
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		<item>
		<title>Mover /home para a uma partição independente em Ubuntu</title>
		<link>http://eloiribeiro.wordpress.com/2011/01/11/mover-home-para-a-uma-particao-independente-em-ubuntu/</link>
		<comments>http://eloiribeiro.wordpress.com/2011/01/11/mover-home-para-a-uma-particao-independente-em-ubuntu/#comments</comments>
		<pubDate>Tue, 11 Jan 2011 06:00:36 +0000</pubDate>
		<dc:creator>Eloi</dc:creator>
				<category><![CDATA[linux]]></category>
		<category><![CDATA[ubuntu]]></category>

		<guid isPermaLink="false">http://eloiribeiro.wordpress.com/?p=560</guid>
		<description><![CDATA[Quando instalamos Ubuntu temos a opção de particionar o disco e deixar o sistema operativo na partição root &#8216;/&#8217; e os nossos documentos na partição &#8217;/home&#8217;. Se optamos por deixar tudo na mesma partição, mais tarde, podemos alterar essa situação sem necessidade de reinstalar todo o sistema. Isto foi o que me passou e deixo aqui os passos necessários para realizar [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=eloiribeiro.wordpress.com&amp;blog=7354167&amp;post=560&amp;subd=eloiribeiro&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Quando instalamos Ubuntu temos a opção de particionar o disco e deixar o sistema operativo na partição <em>root</em> &#8216;/&#8217; e os nossos documentos na partição &#8217;/home&#8217;. Se optamos por deixar tudo na mesma partição, mais tarde, podemos alterar essa situação sem necessidade de reinstalar todo o sistema. Isto foi o que me passou e deixo aqui os passos necessários para realizar esta tarefa.</p>
<p>Passo 1: Copia de segurança.</p>
<p>Passo 2: Adicionar um novo disco ou com <a href="http://pt.wikipedia.org/wiki/GParted">Gparted</a> criar uma partição para /home.</p>
<p>Passo 3: Criar uma pasta, montar ai a recém criada partição ou disco e mudar o dono da pasta. Atenção, será necessário alterar <em>ext4</em>, <em>sda2</em> e <em>eloi</em> pelo sistema de ficheiros, partição e utilizador que vão usar, respectivamente.</p>
<p><pre class="brush: bash;">
sudo mkdir /mnt/nova_home
sudo mount -t ext4 /dev/sda2 /mnt/nova_home
sudo chown eloi /mnt/nova_home/
</pre></p>
<p>Passo 4:  Ir à pasta <em>/home</em> e copiar com a instrução <em>find</em> e <em>cpio</em> todo o conteudo de <em>/home</em> para a nova partição. Quando terminar a copia devemos verificar que está tudo bem copiado e logo desmontar a nova partição.</p>
<p><pre class="brush: bash;">
cd /home/
find . -depth -print0 | cpio --null --sparse -pvd /mnt/nova_home/
sudo umount /mnt/nova_home
</pre></p>
<p>Passo 5: Alterar o nome da pasta <em>/home</em>, criar uma nova e montar ai a nova partição.</p>
<p><pre class="brush: bash;">
sudo mv /home /antiga_home
sudo mkdir /home
sudo mount /dev/sda2 /home
</pre></p>
<p>Passo 6: Editar <em>fstab</em> e adicionar a instrução para que monte <em>/home</em> no arranque do sistema.</p>
<p><pre class="brush: bash;">
sudo gedit /etc/fstab
</pre></p>
<p>E adicionar a seguinte linha:</p>
<p><pre class="brush: bash;">
/dev/sda2 /home ext4 nodev,nosuid 0 2
</pre></p>
<p>Passo 7: Reiniciar o sistema e se tudo está a funcionar como deve ser, apagar a antiga <em>/home</em>.</p>
<p><pre class="brush: bash;">
sudo rm -r /antiga_home
</pre></p>
<p>Terminado.</p>
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