Understanding and Managing RPM in Linux

RPM is a package manager which is used on Linux based OS. It can help in package installation from FTP/HTTP site as well.

Few Feature of RPM

Install Software

Upgrade Software

Remove Software

Query Package Database

Check Package Dependencies

Disadvantages:

RPM can detect package dependecies but cannot install those during main package installation. For this we use other tools like yum

Important queries related to installed packages

1) Check all installed pcakages

rpm -qa

2) List packages in Sorted way

rpm -qa|sort

3) Information about a package installed

rpm -qi zip

Sample Output

[root@lcfs ~]# rpm -qi zip

Name : zip

Version : 3.0

Release : 11.el7

Architecture: x86_64

Install Date: Thursday 09 April 2020 07:18:33 AM IST

Group : Applications/Archiving

Size : 815173

License : BSD

4) Information about packages installed based on group

[root@lcfs ~]# rpm -qa Group="System Environment/Shells"

tcsh-6.18.01-16.el7.x86_64

bash-4.2.46-34.el7.x86_64

5) Find packages installed based on date

rpm -qa --last

6) Find files installed by a package

rpm -ql zip

rpm -qd zip (for all document files for package)

7) Find configuration files related to package installed.

rpm -qc yum

8) Find a file was installed by which package

rpm -qf /bin/bash

9) Find Documentation for a file which was installed via package.

rpm -qfd /bin/bash

10) Find features of a utility

rpm -q --provides bash

11) Check Dependent packages for a package

rpm -q --requires zip

12) Find all changes to a package done(like changes in package development)

rpm -q --changelog zip

Important queries related to rpm packages before installation

1) Find Package information for RPM.

rpm -qip httpd-2.4.6-93.el7.centos.x86_64.rpm

2) Find all the files inside a RPM package

rpm -qlp httpd-2.4.6-93.el7.centos.x86_64.rpm

Please note the most command will run on rpm also but we have to give "p" option for checking

Extract a rpm

rpm2cpio |cpio -id

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