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What is yum

Wiki definition

The Yellowdog Updater, Modified (yum) is an open-source command-line package-management utility for Linux operating systems using the RPM Package Manager.[2] Though yum has a command-line interface, several other tools provide graphical user interfaces to yum functionality.

Yum allows automatic updates, package and dependency management, on RPM-based distributions.[3] Like the Advanced Packaging Tool (APT) from Debian, yum works with software repositories (collections of packages), which can be accessed locally[4] or over a network connection.

Under the hood, yum depends on RPM, which is a packaging standard for digital distribution of software, which automatically uses hashes and digisigs to verify the authorship and integrity of said software; unlike some app stores, which serve a similar function, neither yum nor RPM provide built-in support for proprietary restrictions on copying of packages by endusers. Yum is implemented as libraries in the Python programming language, with a small set of programs that provide a command-line interface.[5] GUI-based wrappers such as Yum Extender (yumex) also exist.[6]

It can perform operations such as:

  1.     installing packages
  2.     deleting packages
  3.     updating existing installed packages
  4.     listing available packages
  5.     listing installed packages

1) Install a package:

   # yum install package

Example:

   # yum install httpd

2) Remove a package:

   # yum remove package

Example:

   # yum remove httpd

3) Update a package:

   # yum update package

Example:

   # yum update httpd

4) Search for a package:

   # yum search package

Example:

   # yum search httpd

5) Find information about a package:

   # yum info package

Example:

   # yum info httpd

6) List packages containing a certain term:

   # yum list term

Example:

   # yum list httpd

7) List available updates:

   # yum list updates

Example:

   # yum list updates

8) Find what package provides a particular file:

   # yum whatprovides 'path/filename'

Example:

   # yum whatprovides 'etc/httpd.conf'

   # yum whatprovides '*/libXp.so.6'

9) Update all installed packages with kernel package :

   # yum update

Example:

   # yum update

10) To update a specific package:

   # yum update

Example:

   # yum update openssh-server

11) To update a specific package and a specific version:

yum update-to packagename-ver-rel

Example:

   # yum update-to gcc-4.1.2-54.el5


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