up2date command was part of RHEL v4.x or older version. You need to use yum command to update and patch the system using RHN or Internet. Use yum command to install critical and non-critical security updates as well as binary packages. Login as the root user to install and update the system.
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
WARNING!
These examples only works with
RHEL / CentOS Linux version 5.x or above. Task: Display list of updated software (security fix)
Type
the following command at shell prompt:
# yum
list updatesTask: 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 httpdTask: Check for and update specified packages
#
yum update {package-name-1}To check for and update httpd package, enter:
#
yum update httpdTask: 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 httpdTask: Remove / Uninstall the specified packages [ RPM(s) ]
Remove
package called httpd, enter:
#
yum remove {package-name-1} {package-name-2}
# yum remove httpdTask: Display the list of available packages
#
yum list allTask: Display list of group software
Type
the following command:
#
yum grouplistOutput:
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.i386Task: 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 extrasSample 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 whatprovides /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
same command to list packages that satisfy dependencies:
#
yum whatprovides {dependency-1} {dependency-2}Refer yum command man page for more information:
#
man yum
