YUM

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Task: 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

Task: Display list of updated software (security fix)

Type the following command at shell prompt:

# yum list updates

Task: Patch up system by applying all updates

To download and install all updates type the following command:

# yum update

Task: 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

Task: Check for and update specified packages

# yum update {package-name-1}

To check for and update httpd package, enter:

# yum update httpd

Task: 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 

Task: Install the specified packages [ RPM(s) ]

Install package called httpd:

# yum install {package-name-1} {package-name-2}
# yum install httpd

Task: Remove / Uninstall the specified packages [ RPM(s) ]

Remove package called httpd, enter:

# yum remove {package-name-1} {package-name-2}
# yum remove httpd

Task: Display the list of available packages

# yum list all

Task: 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

Task: Install all the default packages by group

Install all 'Development Tools' group packages, enter:

# yum groupinstall "Development Tools"

Task: Update all the default packages by group

Update all 'Development Tools' group packages, enter:

# yum groupupdate "Development Tools"

Task: Remove all packages in a group

Remove all 'Development Tools' group packages, enter:

# yum groupremove "Development Tools"

Task: 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

Task: 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       installed
kernel.i686                              2.6.18-8.1.15.el5      installed
kernel-devel.i686                        2.6.18-8.1.15.el5      installed
lighttpd.i386                            1.4.18-1.el5.rf        installed
lighttpd-fastcgi.i386                    1.4.18-1.el5.rf        installed
psad.i386                                2.1-1                  installed
rssh.i386                                2.3.2-1.2.el5.rf       installed

Task: Display what package provides the file

  • You can easily find out what RPM package provides the file. For example find out what provides the /etc/passwd file:
# yum provides /etc/passwd

Sample output:

Loading "installonlyn" plugin
Loading "security" plugin
Setting up repositories
Reading repository metadata in from local files   

setup.noarch                             2.5.58-1.el5           base
Matched from:
/etc/passwd 

setup.noarch                             2.5.58-1.el5           installed 
Matched from:
/etc/passwd

You can use wildcards if you don't know the paths. This searches for a filename beginning with gcc:

# yum provides \*/gcc\*

(Note, this will often produce a long list....)

...
libmudflap-devel-4.1.1-52.el5.2.x86_64 : GCC mudflap support
Repo        : rhel-x86_64-server-5
Matched from:
Filename    : /usr/lib/gcc

gcc-c++-4.1.1-52.el5.x86_64 : C++ support for GCC
Repo        : rhel-x86_64-server-5
Matched from:
Filename    : /usr/lib/gcc
Filename    : /usr/libexec/gcc
...
  • You can use same command to list packages that satisfy dependencies:
# yum provides {dependency-1} {dependency-2}