What Is Linux Software YUM And RPM

In this article, we’ll explain what is Linux software yum and rpm.

What is Linux Software YUM and RPM

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It is called a Package
It is a file with extension “.rpm”
Naming convention of the file is as follows
- <name> – <version> – <release>.<architecture>.rpm

Eg: ftp-0.17-51.1.rl6.i686.rpm [ads1]

It is a directory on any server which contains all rpm packages and its dependency information
Yum command downloads the packages from this server and installed on local machine
Location of this server is stored in a special file under /etc/yum.repos.d/

It is a directory (on local) where information obtained from the yum repository is stored for better performance
The default locations of this directory is /var/cache/yum
It can be changed by modifying /etc/yum.conf [ads3]

A list of dependent packages is obtained from the yum repository
A check is made to find out if all dependent packages are installed or not
Dependent packages are installed first
Required packages are installed later
What if any packages are installed, multiple files are extracted from the packages and copied to various directories with proper file permissions and ownership.
The rpm database under /var/lib/rpm is updated with the new package information.

Install [-ivh]

Uninstall [-ev]

Upgrade [-Uvh]

Query [-q]

Commands	Help Notes
rpm –q –a	Query all installed packages on system
rpm –qa \| grep ftp	Find if ftp is installed or not
rpm –q ftp
rpm –qi nmap	Complete info about nmap and packages
rpm –qa \|more
rpm –ql nmap	List all files installed by nmap packages

[box type=”note” align=”” class=”” width=””]When U Install any Packages on the system it contains[/box]

Commands	Help Notes
rpm –qs nmap	List the scripts file installed by nmap packages
rpm –qd nmap	List all doc of packages
rpm –qc nmap	List config files of packages
rpm –q –requires nmap	List Dependencies
rpm –q –last nmap	Know when was lastly installed
rpm –qf /usr/share/ncat	To check which package as installed this file and also it displays the package name
rpm –q –i –p <package.rpm>	Find info about package from the rpm file not from the rpm database
rpm –ivh <package.rpm>	Install the package