yum command: Update / Install Packages Under Redhat Enterprise / CentOS Linux Version 5.x

REGISTER MY SYSTEM WITH RHN

To register your system with RHN type the following command and just follow on screen instructions (CentOS user skip to next step):
 
# rhn_register

Display list of updated software (security fix) 
Type the following command at shell prompt:
 
# yum list updates

PATCH UP SYSTEM BY APPLYING ALL UPDATES

To download and install all updates type the following command:
 
# yum update 

LIST ALL INSTALLED PACKAGES

List all installed packages, enter:
 
# rpm -qa
 
# yum list installed 

Find out if httpd package installed or not, enter:
 
# rpm -qa | grep httpd*
 
# yum list installed httpd

CHECK FOR AND UPDATE SPECIFIED PACKAGES

# yum update {package-name-1}

To check for and update httpd package, enter:
 
# yum update httpd

SEARCH FOR PACKAGES BY NAME

Search httpd and all matching perl packages, enter:
 
# yum list {package-name}
 
# yum list {regex}
 
# yum list httpd
 
# yum list perl*

Sample output:

Loading "installonlyn" plugin
Loading "security" plugin
Setting up repositories
Reading repository metadata in from local files
Installed Packages
perl.i386                                4:5.8.8-10.el5_0.2     installed
perl-Archive-Tar.noarch                  1.30-1.fc6             installed
perl-BSD-Resource.i386                   1.28-1.fc6.1           installed
perl-Compress-Zlib.i386                  1.42-1.fc6             installed
perl-DBD-MySQL.i386                      3.0007-1.fc6           installed
perl-DBI.i386                            1.52-1.fc6             installed
perl-Digest-HMAC.noarch                  1.01-15                installed
perl-Digest-SHA1.i386                    2.11-1.2.1             installed
perl-HTML-Parser.i386                    3.55-1.fc6             installed
.....
.......
..
perl-libxml-perl.noarch                  0.08-1.2.1             base
perl-suidperl.i386                       4:5.8.8-10.el5_0.2     updates 

INSTALL THE SPECIFIED PACKAGES [ RPM(S) ]

Install package called httpd:
 
# yum install {package-name-1} {package-name-2}
 
# yum install httpd

REMOVE / UNINSTALL THE SPECIFIED PACKAGES [ RPM(S) ]

Remove package called httpd, enter:
 
# yum remove {package-name-1} {package-name-2}
 
# yum remove httpd

Display the list of available packages 

# yum list all

DISPLAY LIST OF GROUP SOFTWARE

Type the following command:
 
# yum grouplist

Output:

Installed Groups:
   Engineering and Scientific
   MySQL Database
   Editors
   System Tools
   Text-based Internet
   Legacy Network Server
   DNS Name Server
   Dialup Networking Support
   FTP Server
   Network Servers
   Legacy Software Development
   Legacy Software Support
   Development Libraries
   Graphics
   Web Server
   Ruby
   Printing Support
   Mail Server
   Server Configuration Tools
   PostgreSQL Database
Available Groups:
   Office/Productivity
   Administration Tools
   Beagle
   Development Tools
   GNOME Software Development
   X Software Development
   Virtualization
   GNOME Desktop Environment
   Authoring and Publishing
   Mono
   Games and Entertainment
   XFCE-4.4
   Tomboy
   Java
   Java Development
   Emacs
   X Window System
   Windows File Server
   KDE Software Development
   KDE (K Desktop Environment)
   Horde
   Sound and Video
   FreeNX and NX
   News Server
   Yum Utilities
   Graphical Internet
Done

INSTALL ALL THE DEFAULT PACKAGES BY GROUP

Install all 'Development Tools' group packages, enter:
 
# yum groupinstall "Development Tools"

UPDATE ALL THE DEFAULT PACKAGES BY GROUP

Update all 'Development Tools' group packages, enter:
 
# yum groupupdate "Development Tools"

REMOVE ALL PACKAGES IN A GROUP

Remove all 'Development Tools' group packages, enter:
 
# yum groupremove "Development Tools"

INSTALL PARTICULAR ARCHITECTURE PACKAGE

If you are using 64 bit RHEL version it is possible to install 32 packages:
 
# yum install {package-name}.{architecture}
 
# yum install mysql.i386

DISPLAY PACKAGES NOT INSTALLED VIA OFFICIAL RHN SUBSCRIBED REPOS

Show all packages not available via subscribed channels or repositories i.e show packages installed via other repos:
 
# yum list extras

Sample output:

Loading "installonlyn" plugin
Loading "security" plugin
Setting up repositories
Reading repository metadata in from local files
Extra Packages
DenyHosts.noarch                         2.6-python2.4          installed
VMwareTools.i386                         6532-44356             installed
john.i386                                1.7.0.2-3.el5.rf