What is YUM?
YUM(Yellowdog Updater Modified) is an open source command-line as well
as graphical based package management tool for RPM(RedHat Package
Manager) based Linux systems.
It allows users and system administrator to easily install, update,
remove, or search software packages on a systems.
YUM uses numerous third party repositories to install packages
automatically by resolving their dependencies issues.
1. Install a Package with YUM
To install a package called Firefox 14, just run the below command it
will automatically find and install all required dependencies for
Firefox.
yum install firefox
The above command will ask confirmation before installing any package
on your system. If you want to install packages automatically without
asking any confirmation, use option -y as shown in below example.
yum -y install firefox
2. Removing a Package with YUM
To remove a package completely with their all dependencies, just run
the following command as shown below.
yum remove firefox
Same way the above command will ask confirmation before removing a
package. To disable confirmation prompt just add option -y as shown in
below.
yum -y remove firefox
3. Updating a Package using YUM
Lets say you have outdated version of MySQL package and you want to update it to the latest stable version. Just run the following commandit will automatically resolves all dependencies issues and
install them.`
yum update mysql
4. List a Package using YUM
Use the list function to search for the specific package with name.
For example to search for a package called openssh. use the command.
yum list openssh
You can also use the below command to search the installed packages.
yum list installed | grep mongo
5. Search for a Package using YUM
If you don`t remember the exact name of the package, then use search
function to search all the available packages to match the name of
the package you specified. For example, to search all the packages
that matches the word.
yum search vsftpd
6. Get Infomation of a Package using YUM
Say you would like to know information of a package before installing
it. To get information of a package just issue the below command.
yum info firefox
7. List all Available Packages using YUM
To list all the available packages in the YUM database, use the below
command.
yum list | less
8. list all Installed Packages using YUM
yum list installed | less
9. YUM Provides Function
YUM provides function is used to find which package a specific
file belongs to. For example, if you would like to known
the name of the package that has the /etc/httpd/conf/httpd.conf
yum provides /etc/httpd/conf/httpd.conf
But if you rename the default name of the file, it can`t find the
package belongs to. For example like below
yum provides /etc/mongod37017.conf
10 Check for Available Updates using YUM
To find how many of installed packages on your system have updates
available, to check use the following command
yum check-update
11. Update System using YUM
To keep your system up-to-date with all security and binary package
updates, run the following command. It will install all lastest
patches and security updates to your system.
yum update
12. List all available Group Packages
In Linux, number of packages are bundled to particular group.
Instead of installing individual packages with yum, you can
install particular group that will install all the related
packages that belongs to the group. For example to list all
the available groups, just issue following command.
yum grouplist
13. Install a Group Packages
To install a particular package group, we use option as groupinstall.
For example, to install "MySQL Database"
yum groupinstall 'MySQL Database'
14. Update a Group Packages
To update any existing installed group packages, just run the
following command as shown below.
yum groupupdate 'DNS Name Server'
15. Remove a Group Packages
To delete or remove any existing installed group from the system,
just use below command.
yum groupremove 'DNS Name Server'
16. List Enabled YUM Repositories
To list all enabled YUM repositories in your system, use following
option.
yum repolist
17. List all Enabeled and Disabled YUM Repositories
The following command will display all enabled and disabled yum
repositores on the system.
yum repolist all
18. Install a Package from Specific Repository
To install a particular package from a specific enabled or disabled
repository, you must use --enablerepo option in your yum command.
For example to Install PhpMyAdmin 3.5.2 package, just execute the
command
yum --enablerepo=epel install phpmyadmin
19. Interactive YUM Shell
YUM utility provides a custom shell where you can execute multiple
commands.
yum shell
20. Clean YUM Cache
By default yum keeps all the repository enabled package data in
/var/cache/yum/ with each sub-directory, to clean all cached files
from enabled repository, you need to run the following command
regularly to clean up all the cache and make sure that there is
noting unnecessary space is using. We don`t want to give the output
of the below command, because we like to keep cached data as it is.
yum clean all
21. View History of YUM
To view all the past transactions of yum command, just use the
following command.
yum history
Loaded plugins: fastestmirror
ID | Login user | Date and time | Action(s) | Altered
-------------------------------------------------------------------------------
10 | root | 2012-08-11 15:19 | Install | 3
9 | root | 2012-08-11 15:11 | Install | 1
8 | root | 2012-08-11 15:10 | Erase | 1 EE
7 | root | 2012-08-10 17:44 | Install | 1
6 | root | 2012-08-10 12:19 | Install | 2
5 | root | 2012-08-10 12:14 | Install | 3
4 | root | 2012-08-10 12:12 | I, U | 13 E<
3 | root | 2012-08-09 13:01 | Install | 1 >
2 | root | 2012-08-08 20:13 | I, U | 292 EE
1 | System | 2012-08-08 17:15 | Install | 560
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