Request RPM packages ("Redhat-like" GNU/Linux distribution)

Request RPM packages ("Redhat-like" GNU/Linux distribution)
A simple refresh of what can be done with rpm tool.

To begin, the -q option allow to select the RPM packages to request.
The -a option allow to select all (potentially with a pattern to match).
Name, pattern and even version can be specified for greatest precision in selection.

All those commands query installed packages.

Get the list of packages:
rpm -qa

Get the list of packages matching a specific pattern:
rpm -qa pattern
For instance for X libraries: rpm -qa lib*X*

General information about a package:
rpm -qi myPackageName[-myCompletePackageVersion]
For instance, for a specific kernel: rpm -qi kernel-2.6.20-1.2962.fc6

Get the list of files of a package:
rpm -ql myPackageName[-myCompletePackageVersion]

Get ChangeLog of a package:
rpm -q --changelog myPackageName[-myCompletePackageVersion]

Get the list of packages needed by another package:
rpm -qR myPackageName[-myCompletePackageVersion]

Get the list of what provides a package:
rpm -q --provides myPackageName[-myCompletePackageVersion]

Get the list of packages providing a specific functionality:
rpm -q --whatprovides functionalityName
For instance, for the perl functionality "Authen::SASL": rpm -q --whatprovides "perl(Authen::SASL)"

Get the package providing a specific file:
rpm -qf myFilePath*
*: the path can be relative to current directory or absolute

To get the general information of the package providing a specific file (under GNU/Bash) with only one command line:
rpm -qi $( rpm -q --file myFilePath )