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
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