Working Gmail as relayhost

https://help.ubuntu.com/community/GmailPostfixFetchmail

 

Introduction

How to use Postfix and Fetchmail to access a single Gmail account using an old-fashioned client such as mutt or Emacs GNUS.

If you use Evolution or a similar modern e-mail client, you do not need to use this. Your client has the ability to connect directly to the Gmail POP3 and SMTP services.

This setup is intended to be as simple and as close to a standard Ubuntu configuration as possible. This setup does not verify the Gmail SMTP server certificate.
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Yum info | managing packages with yum


configuration yum:
$ cat /etc/yum.conf

list installed (and installed packagename)
$ yum list
$ yum list | grep -i packagename

info packagename
$ yum info packagename

search packagename
$ yum search packagename

dependency list
$ yum deplist packagename

install packagename
$ yum install packagename

update
$ yum update

remove packagename
$ yum remove packagename

links:
http://prefetch.net/articles/yum.html