====== Redhat Package Manager ======

====== Tips ======
Check if a package is installed:
<code>$ rpm -qa | grep core
openoffice.org-core-2.3.0-6.10.el5
coreutils-5.97-19.el5
policycoreutils-1.33.12-14.2.el5</code>
List files in a certain package:
<code>$ rpm -ql coreutils</code>
List files in an RPM:
<code>$ rpm -qlp apcupsd-3.14.7-1.x86_64.rpm</code>
Manually install an rpm (as in, not using a repository with a package manager like yum):
<code>$ sudo rpm -i VirtualBox-3.0.6_52128_rhel5-1.x86_64.rpm</code>
Manually remove an rpm:
<code>$ sudo rpm -e VirtualBox</code>

upgrade a package
<code>rpm -Uvh <package></code>
  * rpm -qa | less  :list all installed software packages
  * rpm -q httpd :show the version of the httpd package, if it is installed
  * rpm -qa | grep httpd : show all installed packages that have httpd in their name
  * rpm -ql httpd : list all files in the httpd package
  * rpm -qd httpd : list all documentation files in the httpd package
  * rpm -qc httpd : list all configuration files in the httpd package
  * rpm -qi httpd : display information about the package
  * rpm -V httpd : verify that the httpd package is correctly installed
  * rpm -qf /etc/passwd :determine which package the /etc/passwd file belongs to
To unistall a package:
<code>rpm -e <package name></code>
<code>rpm -qa | grep -i <packagename></code>
====== Building RPMs ======

An RPM is a pre-compiled package containing binaries and config files, etc which can be installed using ''rpm'' or ''yum'' command line tools.  An SRPM or "source RPM" contains everything you need to rebuild a package.  Sometimes a binary RPM is not available, you can build a custom RPM using the SRPM file.

  * [[http://wiki.centos.org/HowTos/SetupRpmBuildEnvironment|Setting up the RPM build environment]]
  * [[http://wiki.centos.org/HowTos/RebuildSRPM|Rebuilding Source RPMs]]

Install ''rpmbuild'' (from the rpm-build package):
<code>$ sudo yum install rpm-build</code>
Setup your home directory's environment:
<code>$ cp -a /usr/src/redhat/ ~/rpmbuild
$ echo '%_topdir %(echo $HOME)/rpmbuild' > ~/.rpmmacros</code>
Download an SRPM and build:
<code>$ wget http://mirrors.geekymedia.com/centos/python26-2.6-geekymedia1.src.rpm
$rpmbuild --rebuild EMBOSS-5.0.0-1.src.rpm</code>
Install with:
<code>$ sudo rpm -i ~/rpmbuild/RPMS/x86_64/python26-2.6-geekymedia1.x86_64.rpm</code>
If upgrading, use 
<code>$ sudo rpm -U ~/rpmbuild/RPMS/x86_64/python26-2.6-geekymedia1.x86_64.rpm</code>
====== Troubleshooting ======

If you have problems with GPG errors, add a line like this to your ''~/.rpmmacros'':
<file>%_gpg_name Alan</file>
==== Dag Wieers' Repositories ====
----

<file>[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://dag.linux.iastate.edu/dag/redhat/el5/en/$basearch/dag
gpgcheck=1
enabled=1
</file>


<code> rpm --import http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt</code>
Check more on this here http://wiki.centos.org/AdditionalResources/Repositories/RPMForge


==== PBONE REPOS ====
----
<file>
cd /etc/yum.repos.d
wget http://rpm.pidgin.im/centos/pidgin.repo
yum install pidgin
</file>