packages:manage [LMDE journeys]

A PCRE internal error occured. This might be caused by a faulty plugin

====== Differences ====== This shows you the differences between two versions of the page.

--- packages:manage [2014/01/02 02:52]
admin [/etc/apt/sources.list]
+++ packages:manage [2015/11/22 03:33] (current)
admin [Find what package a specific file does come from]
@@ Line 1: / Line 1: @@
-====== Adding a Repo(sitory) to Your Sources ======
+====== Managing Packages ======
+Useful information about managing packages can be found [[http://newbiedoc.sourceforge.net/tutorials/apt-get-intro/info.html.en|in the Source Forge newbie documentation]].
-==== Package Management ====
+Here are a few commands that might come handy whenever you seek information about [installed] packages on your system:
+==== Updating package list from sources ====
+One thing you always need to do before working with packages on your system, is **make sure your package list is up-to-date**, this is achieved by using this command:
+<code>
+sudo apt-get update
+</code>
+This will simply update your package list information, it won't install or modify anything further, so it is safe to run anytime.
+==== Search the package descriptions you've downloaded ====
+apt-cache only knows about the **package descriptions you've already downloaded**, to search among **ALL** known Debian packages you need to browse to [[http://packages.debian.org/]] to see what's available.
+Example: getting information about php
+<code>
+sudo apt-cache search php5
+</code>
+==== Get more information about a package ====
+To display what a package is designed to do, use:
+<code>
+apt-cache show php5-dev
+</code>
+==== Get versionning information ====
+<code>
+apt-cache policy <package>
+</code>
+==== List all installed packages ====
+To show **what packages are installed** on your system, and know if they need configuration use:
+<code>
+sudo dpkg -l
+</code>
+You can limit the output using grep:
+<code>
+sudo dpkg -l | grep php
+</code>
+**NOTE** dpkg -l can be use with the \* or '*' argument to also list uninstalled packages:
+<code>
+sudo dpkg -l \*
+sudo dpkg -l \*php\*
+</code>
+This is equivalent to:
+<code>
+sudo dpkg -l '*'
+sudo dpkg -l '*php*'
+</code>
+This will let you know what packages are installed (ii), uninstalled (un) or are marked to be purged (pn).
+==== Find what package a specific file does come from ====
+Here's how to find which package contains/supplies a certain file:
+<code>
+sudo dpkg -S postmaster
+sudo dpkg -S 'doc/*sql' | cut -f1 -d: | sort -u
+</code>
+==== Removing an Installed Package ====
+To completely remove an already installed package:
+<code>
+> apt-get --purge remove <package>
+</code>
+===== Adding a Repo(sitory) to Your Sources =====
+==== Package Repositories ====
 Debian and Debian based distributions (Linspire, Xandros, Ubuntu, and Mepis to name a few) use a tool called APT (Advanced Packaging Tool) to manage all software on the system. The term "package" refers to an individual file with a .deb extension that contains either all or part of an application.
@@ Line 8: / Line 73: @@
 Linux Mint Debian Edition comes with some default repositories that are already setup, but these contain only a portion of the freely available software out there waiting for you.
+==== Choosing a Mirror ====
+<wrap todo>TO BE COMPLETED</wrap>
 ==== /etc/apt/sources.list ====
@@ Line 26: / Line 93: @@
 sudo nano /etc/apt/sources.list.d/new-repo.list
 -----
-deb http://download.repository.org/virtualbox/debian squeeze contrib non-free
+deb http://download.myrepo.org/repository/debian wheezy contrib non-free
+deb-src http://download.myrepo.org/repository/debian wheezy contrib non-free
+-----
+CTRL-x > Y (exit nano and save file)
+</code>
+==== Source Packages ====
+Not all repos provide source packages, if a repo only provides .deb packages, omit the second line (deb-src) when adding the repo to your sources. Otherwise, apt-get update will stop with an error of type:
+<code>
+Failed to fetch http://download.myrepo.org/repository/debian/dists/wheezy/InRelease
+Unable to find expected entry 'contrib/source/Sources' in Release file (Wrong sources.list entry or malformed file)
 </code>
 ==== Signing Keys ====
@@ Line 45: / Line 122: @@
 <code>
-sudo add-apt-repository deb http://download.virtualbox.org/virtualbox/debian wheezy contrib
+sudo add-apt-repository deb http://download.myrepo.org/repository/debian wheezy contrib
 </code>
@@ Line 52: / Line 129: @@
 sudo apt-get install python-software-properties
 </code>
-==== Package / Software Managers ====
+===== Package / Software Managers =====
+<wrap todo>TO BE COMPLETED</wrap>