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Bug#533267: release-notes: Purging uninstalled packages

On 11/24/2014 01:01:10 AM, Niels Thykier wrote:
> Control: tags -1 pending
> On 2014-11-24 07:40, Andrei POPESCU wrote:
> > On Du, 23 nov 14, 22:54:20, Niels Thykier wrote:
> >>
> >> Note, I opted for using dpkg -l + awk rather than aptitude, 
> because
> a)
> >> all users have dpkg + awk and b) we have started requrcommending
> apt-get
> >> over aptitude again for upgrades.

This makes lots of sense.  There is a potential for problems
that I've not yet investigated:  I notice that often the
default apt output format will truncate very long package
names.  I don't know if this is true of dpkg -l or not,
but, possibly, dpkg-query -W might be an alternative
that does not truncate.  (Sorry for not investigating

> >  
> > Since aptitude is Priority: standard most systems will have it 
> > installed. Could it at lease be mentioned as alternative, as the
> command 
> > is much simpler?

> Thanks for the review, I have applied all of your suggested changes
> (see
> the attached patch).

Attached is a patch that a) simplifies the language by cutting
out words.  b) adds a little additional explanation.

Karl <kop@meme.com>
Free Software:  "You don't pay back, you pay forward."
                 -- Robert A. Heinlein
--- /tmp/ch-upgrading.en.html	2014-11-24 07:17:17.890424702 -0600
+++ /tmp/ch-upgrading.en.html.new	2014-11-24 07:22:54.466217910 -0600
@@ -799,13 +799,14 @@
 is complete, but there are some other things that should be taken care of
 <span class="emphasis"><em>before</em></span> the next reboot.
 </p><div class="section" title="4.7.1. Purging removed packages"><div class="titlepage"><div><div><h3 class="title"><a id="purge-removed-packages"></a>4.7.1. Purging removed packages</h3></div></div></div><p>
-    It is generally advisable to purge removed packages.  This is
-    especially true, if these have been removed in an earlier release
+    It is generally advisable to purge removed packages.  This removes
+    unused configuration files, etc.  Purging is
+    especially advisable for packages removed in an earlier release
     upgrade (e.g. from the upgrade to wheezy) or from
     third-party vendors.  In particular, old init.d scripts have been
     known to cause issues.
   </p><div class="caution" title="Caution" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Caution"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="images/caution.png" /></td><th align="left">Caution</th></tr><tr><td align="left" valign="top"><p>
-      Purging a package will generally also purge its log files, so
+      Purging a package usually purges its log files, so
       you might want to back them up first.
     The following command displays a list of all removed packages that
@@ -814,13 +815,13 @@
     # dpkg -l | awk '/^rc/ { print $2 }'
     The packages can be removed by using <span class="command"><strong>apt-get
-    purge</strong></span>.  Assuming you want to purge all of them
+    purge</strong></span>.  To purge all of them
     in one go, you can use the following command:
   </p><pre class="screen">
     # apt-get purge $(dpkg -l | awk '/^rc/ { print $2 }')
-    If you use <code class="systemitem">aptitude</code><a id="idp726112" class="indexterm"></a>, you
-    can also use the following alternative to the commands above:
+    Using <code class="systemitem">aptitude</code><a id="idp726112" class="indexterm"></a>, 
+    the alternative to the above commands are:
   </p><pre class="screen">
     $ aptitude search '~c'
     $ aptitude purge '~c'

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