What is the yum command (Yellowdog Updater Modified) ?


yum is a software package manager. It is a tool for installing, updating, and removing packages and their dependencies on RPM-based systems. It automatically computes dependencies and figures out what things should occur to install packages. It makes it easier to maintain groups of machines without having to manually update each one using rpm.

yum is wrapper around rpm.

Features include:

  • Support for multiple repositories
  • Simple configuration
  • Dependency calculation
  • Fast operation
  • RPM-consistent behavior
  • Package group support, including multiple-repository groups
  • Simple interface

up2date is now deprecated in favor of yum (Yellowdog Updater Modified). The entire stack of tools which installs and updates software in Red Hat Enterprise Linux 5.2 is now based on yum.


yum should be already installed but you can install utility command such as the yum-config-manager

yum install yum-utils


For the manipulation of package, see Linux - RPM package (RPM: Red Hat Package Manager)

List installed package

sudo yum list installed

Search packages

sudo yum list searchTerm

Upgrade all package

  • Yum Assume yes
yum -y update
- name: 'Upgrade all packages'
  when: ansible_os_family == "RedHat" # Centos




#  This is the default, if you make this bigger yum won't see if the metadata
# is newer on the remote and so you'll "gain" the bandwidth of not having to
# download the new metadata and "pay" for it by yum not having correct
# information.
#  It is esp. important, to have correct metadata, for distributions like
# Fedora which don't keep old packages around. If you don't like this checking
# interupting your command line usage, it's much better to have something
# manually check the metadata once an hour (yum-updatesd will do this).
# metadata_expire=90m

# PUT YOUR REPOS HERE OR IN separate files named file.repo
# in /etc/yum.repos.d


See Linux - Package Repository


Search a shared library


yum whatprovides 'libXrender.so.1'


Loaded plugins: ulninfo
libXrender-0.9.8-2.1.el7.i686 : X.Org X11 libXrender runtime library
Repo        : ol7_latest
Matched from:
Provides    : libXrender.so.1

libXrender-0.9.10-1.el7.i686 : X.Org X11 libXrender runtime library
Repo        : ol7_latest
Matched from:
Provides    : libXrender.so.1


For more information on yum:

man yum


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