Yellow dog Updater, Modified. Updates software packages
Now lets see the manual of yum service.Manual yum:NAME
yum - Yellowdog Updater ModifiedSYNOPSIS
yum [options] [command] [package ...]DESCRIPTION
yum is an interactive, automated update program which can be used for maintaining systems using rpm
command is one of:
* install package1 [package2] [...]
* update [package1] [package2] [...]
* upgrade [package1] [package2] [...]
* remove | erase package1 [package2] [...]
* list [...]
* info [...]
* provides | whatprovides feature1 [feature2] [...]
* clean [ packages | headers | metadata | cache | dbcache | all ]
* groupinstall group1 [group2] [...]
* groupupdate group1 [group2] [...]
* grouplist [hidden]
* groupremove group1 [group2] [...]
* groupinfo group1 [...]
* search string1 [string2] [...]
* shell [filename]
* resolvedep dep1 [dep2] [...]
* localinstall rpmfile1 [rpmfile2] [...]
* localupdate rpmfile1 [rpmfile2] [...]
* deplist package1 [package2] [...]
Unless the --help or -h option is given, one of the above commands must be present.
Is used to install the latest version of a package or group of packages while ensuring that all dependencies
are satisfied. If no package matches the given package name(s), they are assumed to be a shell glob and any
matches are then installed.
update If run without any packages, update will update every currently installed package. If one or more packages
are specified, Yum will only update the listed packages. While updating packages, yum will ensure that all
dependencies are satisfied. If no package matches the given package name(s), they are assumed to be a shell
glob and any matches are then installed.
If the --obsoletes flag is present yum will include package obsoletes in its calculations - this makes it
better for distro-version changes, for example: upgrading from somelinux 8.0 to somelinux 9.
Implemented so you could know if your machine had any updates that needed to be applied without running it
interactively. Returns exit value of 100 if there are packages available for an update. Also returns a list
of the pkgs to be updated in list format. Returns 0 and no packages are available for update.
Is the same as the update command with the --obsoletes flag set. See update for more details.
remove or erase
Are used to remove the specified packages from the system as well as removing any packages which depend on
the package being removed.
list Is used to list various information about available packages; more complete details are available in the
List Options section below.
provides or whatprovides
Is used to find out which package provides some feature or file. Just use a specific name or a file-glob-
syntax wildcards to list the packages available or installed that provide that feature or file.
search Is used to find any packages matching a string in the description, summary, packager and package name fields
of an rpm. Useful for finding a package you do not know by name but know by some word related to it.
info Is used to list a description and summary information about available packages; takes the same arguments as
in the List Options section below.
clean Is used to clean up various things which accumulate in the yum cache directory over time. More complete
details can be found in the Clean Options section below.
shell Is used to enter the 'yum shell', when a filename is specified the contents of that file is executed in yum
shell mode. See yum-shell(8) for more info
Is used to list packages providing the specified dependencies, at most one package is listed per dependency.
Is used to install a set of local rpm files. If required the enabled repositories will be used to resolve
Is used to update the system by specifying local rpm files. Only the specified rpm files of which an older
version is already installed will be installed, the remaining specified packages will be ignored. If
required the enabled repositories will be used to resolve dependencies.
Produces a list of all dependencies and what packages provide those dependencies for the given packages.GENERAL OPTIONS
Most command line options can be set using the configuration file as well and the descriptions indicate the necessary
configuration option to set.
Help; display a help message and then quit.
-y Assume yes; assume that the answer to any question which would be asked is yes.
Configuration Option: assume-yes
-c [config file]
Specifies the config file location - can take http, ftp urls and local file paths.
Sets the debugging level to [number] - turns up or down the amount of things that are printed. Practical
range: 0 - 10
Configuration Option: debuglevel
Sets the error level to [number] Practical range 0 - 10. 0 means print only critical errors about which you
must be told. 1 means print all errors, even ones that are not overly important. 1+ means print more errors
(if any) -e 0 is good for cron jobs.
Configuration Option: errorlevel
-R [time in minutes]
Sets the maximum amount of time yum will wait before performing a command - it randomizes over the time.
-C Tells yum to run entirely from cache - does not download or update any headers unless it has to to perform
the requested action.
Reports the yum version number and exits.
Specifies an alternative installroot, relative to which all packages will be installed.
Configuration Option: installroot
Enables specific repositories by id or glob that have been disabled in the configuration file using the
Configuration Option: enabled
Disables specific repositories by id or glob.
Configuration Option: enabled
This option only has affect for an update, it enables yum?s obsoletes processing logic. For more information
see the update command above.
Configuration Option: obsoletes
Exclude a specific package by name or glob from updates on all repositories.
Configuration Option: exclude
Run with all plugins disabled.
Configuration Option: pluginsLIST OPTIONS
The following are the ways which you can invoke yum in list mode. Note that all list commands include information
on the version of the package.
yum list [all | regexp1] [regexp2] [...]
List all available and installed packages.
yum list available [regexp1] [...]
List all packages in the yum repositories available to be installed.
yum list updates [regexp1] [...]
List all packages with updates available in the yum repositories.
yum list installed [regexp1] [...]
List the packages specified by args. If an argument does not match the name of an available package, it is
assumed to be a shell-style glob and any matches are printed.
yum list extras [regexp1] [...]
List the packages installed on the system that are not available in any yum repository listed in the config
yum list obsoletes [regexp1] [...]
List the packages installed on the system that are obsoleted by packages in any yum repository listed in the
yum list recent
List packages recently added into the repositories.
Specifying package names
All the list options mentioned above take file-glob-syntax wildcards or package names as arguments, for
example yum list available foo* will list all available packages that match foo*.CLEAN OPTIONS
The following are the ways which you can invoke yum in clean mode.
yum clean packages
Eliminate any cached packages from the system. Note that packages are not automatically deleted after they
yum clean headers
Eliminate all of the files which yum uses to determine the remote availability of packages. Using this
option will force yum to download all the headers the next time it is run.
yum clean all
Runs yum clean packages and yum clean headers as above.MISC
Specifying package names
A package can be referred to for install,update,list,remove etc with any of the following:
For example: yum remove kernel-2.4.1-10.i686PLUGINS
Yum can be extended through the use of plugins. A plugin is a Python ".py" file which is installed in one of the
directories specified by the pluginpath option in yum.conf. For a plugin to work, the following conditions must be
1. The plugin module file must be installed in the plugin path as just described.
2. The global plugins option in /etc/yum.conf must be set to '1'.
3. A configuration file for the plugin must exist in /etc/yum/pluginconf.d/<plugin_name>.conf and the enabled set-
ting in this file must set to '1'. The minimal content for such a configuration file is:
enabled = 1
See the yum.conf(5) man page for more information on plugin related configuration options.FILES
See the Authors file included with this program.BUGS
There of course aren't any bugs, but if you find any, you should first consult the Faq mentioned above and then
email the mailing list: firstname.lastname@example.org or filed in bugzilla.