Hi,

Can anybody pls tell me the difference between upgrading a package using rpm -U command and updating it using yum update packagename.

Thanks in advance
Veerendra

In the first case you need to download the *RIGHT* package by hand and in the second case yum will find and download the proper package for your distribution.

If yum does not have the package you need to either add a a repository in /etc/yum.repo.d, the site your package is at will tell you how to do this (eg. webmin, rpmforge, opsview, and so on) or you can download a some_package.rpm file and use

yum localinstall some_package.rpm

It is generally not a good idea to use rpm directly on a yum-based system.

Happy installing,
Walter.

The main difference is that rpm does not handle dependencies. yum is a layer over the top (ie individual pkgs/files are in rpm format) that will automatically handle dependencies.
http://kbase.redhat.com/faq/docs/DOC-2531

1 members found this post helpful.

When yum update packagename is run does it uninstall older version of package and install a new version?

See here http://www.linuxtopia.org/online_boo...on/index.html; Chaps 10, 11 (& 12) for the full explanation.

# 5
This link works http://www.linuxtopia.org/online_boo...ion/index.html


# 4
AFAIK, yum uses 'rpm -Uvh <package>' to install packages.

Hi

Consider I have sendmail package installed on my linux server.

what is effect of running rpm -U sendmail..does it uninstall the current version of sendmail installed and delete all conf files of sendmail and install new version of sendmail.

Also what is the effect of running yum update sendmail

Cheers
Veerendra

You can use yum update sendmail or rpm: The -U option with rpm will upgrade an existing package or install the package if it is not already installed, this way, uninstalled
packages are installed, while installed packages are upgraded. The -F option will only upgrade or freshen a package that is already installed. Config files should not be affected.