===== Overview =====

Basic and advanced package management.

===== ELRepo =====

  * [[http://elrepo.org/tiki/tiki-index.php|ELRepo.org]]

Import public key:

<code>
# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org (external link)
</code>

Install ELRepo:

<code>
# rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm (external link)
</code>

===== Basic rpm querying =====

Starting off:

<code>
$ rpm -qa
$ rpm -qa "*core*"
$ rpm -qf /usr/bin/gzip
$ rpm -q gzip
$ rpm -ql gzip
$ rpm -qfl /usr/bin/gzip
</code>

Querying a package:

<code>
$ rpm -ql gzip
$ rpm -qi gzip
$ rpm -qR gzip
$ rpm -q --changelog gzip

$ rpm -qc httpd
$ rpm -qd httpd
$ rpm -q --scripts httpd
</code>

===== (Example) How to install ReiserFS =====

[[https://tthtlc.wordpress.com/2014/09/16/how-to-install-reiserfs-in-centos/|How to install ReiserFS]]:

<code>
$ rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
$ rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
$ yum update
$ yum install kmod-reiserfs reiserfs-utils
</code>