Portals:

• Web Development
  • Jekyll
  • HTML
• Linux
  • Yum
    • Yum cheating sheet
    • Yum dependencies
    • Yum download plugin
  • RPM

Web Development

Jekyll

• A good Jekyll tutorial

HTML

Sharelink: http://www.techicorner.com/2015/09/how-to-create-social-share-buttons-with-custom-icons-2/

Linux

Yum

Yum cheating sheet

»> pdf «<

Yum dependencies

Use following command to list all dependencies of the package:

yum deplist <package>

Or use the command repoquery from yum-utils package to get a tree-like output:

repoquery --tree-requires <package>

You also can find what packages require the given package

repoquery --whatrequires --recursive <package>"

Yum download plugin

Install the package including “downloadonly” plugin:

yum install yum-plugin-downloadonly --nogpgcheck

Use following yum command with “–downloadonly” option as follows:

yum install --downloadonly --downloaddir=<directory> <package>

Or use the following command to download all dependencies:

sudo yum install --installroot=</path/to/tmp_dir> --downloadonly --downloaddir=<rpm_dir> <package>

Notes:

• Before using the plugin, check /etc/yum/pluginconf.d/downloadonly.conf to confirm that this plugin is “enabled=1”
• This is applicable for “yum install/yum update” and not for “yum groupinstall”. Use “yum groupinfo” to identify packages within a specific group.
• If only the package name is specified, the latest available package is downloaded (such as sshd). Otherwise, you can specify the full package name and version (such as httpd-2.2.3-22.el5).
• If you do not use the –downloaddir option, files are saved by default in /var/cache/yum/ in rhel-{arch}-channel/packages
• If desired, you can download multiple packages on the same command.
• You still need to re-download the repodata if the repodata expires before you re-use the cache. By default it takes two hours to expire.

RPM

RPM is a Package Manager for Red Hat, Suse and Fedora Linux. It can be used to build, install, query, verify, update, and remove/erase individual software packages.