Added lots of examples in TL;DR

knowledge base/dnf.md

@@ -1,23 +1,99 @@
-# dnf
+# DNF
 
 ## TL;DR
 
 ```sh
+# Check whether updates are available.
 dnf check-update
 dnf check-update --bugfix --security
 
+# Search package metadata for keywords.
+# Keywords are matched as case-insensitive substrings.
+# Globbing is supported during match.
+# *All* keys are searched in package names and summaries.
+dnf search 'rsync'
+
+# Search packages that match at least *one* of the keys.
+dnf search --all 'rsync'
+
+# Install packages.
+dnf install 'vim' 'jq-0.5.6-1.fc24'
+dnf -y install 'Downloads/tito-0.6.2-1.fc22.noarch.rpm' \
+  --setopt='install_weak_deps=False'
+dnf install 'https://kojipkgs.fedoraproject.org/packages/tito/0.6.0/1.fc22/noarch/tito-0.6.0-1.fc22.noarch.rpm'
+dnf install --advisory='FEDORA-2018-b7b99fe852' \*
+
+# Install groups of packages.
+dnf install '@docker'
+
+# List packages.
+dnf list 'sponge' 'ca-certificates'
+dnf list --installed
+dnf list --obsoletes
+
+# Lists installed packages that are not available in any known repository.
+dnf list --extras
+
+# List packages which would be removed by the 'autoremove' command.
+dnf list --autoremove
+
+# Show packages' description and summary information
+dnf info 'tar'
+
+# Finds the packages providing a given specification.
+dnf provides 'gzip'
+dnf provides '/usr/bin/gzip'
+dnf provides "gzip(x86-64)"
+
+# Remove packages.
+# Also removes their orphaned dependencies.
+dnf remove 'parallel' 'kate'
+
+# Refresh the cache for enabled repositories.
+dnf makecache
+
+# Show information about update advisories.
 dnf updateinfo
 dnf updateinfo list --security
 
-dnf update
-dnf update --bugfix --security
-dnf update --advisories='FEDORA-2021-74ebf2f06f,FEDORA-2021-83fdddca0f'
+# Upgrade packages to the latest version of theirs that is both available and
+# resolvable.
+dnf upgrade
+dnf upgrade --bugfix
+dnf upgrade --nobest --security
+dnf upgrade --advisories='FEDORA-2021-74ebf2f06f,FEDORA-2021-83fdddca0f'
+
+# List summary information about occurred transactions.
+dnf history
+dnf history '3..8'
+dnf history list
+dnf history list '4'
+
+# Show extended information about transactions.
+dnf history info '11'
+
+# Perform the opposite operation of all those performed in the specified one.
+# RPMDB's current state must allow it.
+dnf history undo '5'
+
+# Repeat the specified transaction.
+# RPMDB's current state must allow it.
+dnf history redo '5'
+
+# Undo all transactions performed after the given one.
+# RPMDB's current state must allow it.
+dnf history rollback '7'
 ```
 
 ## Sources
 
+- [Man page]
+- [cheat.sh]
 - [How to install only security and bugfixes updates with DNF]
 
-<!-- project's documentation -->
+<!-- project's references -->
+
 <!-- external references -->
+[cheat.sh]: https://cheat.sh/dnf
 [how to install only security and bugfixes updates with dnf]: https://fedoramagazine.org/how-to-install-only-security-and-bugfixes-updates-with-dnf/
+[man page]: https://man7.org/linux/man-pages/man8/dnf.8.html