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--- devop:apt [2025/10/30] – created hayati
+++ devop:apt [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
@@ Line 1: / Line 1: @@
+~~NOTRANS~~
+====== packages with debian/ubuntu ======
+===== list installed packages =====
+https://askubuntu.com/questions/17823/how-to-list-all-installed-packages
+<code>
+apt list --installed
+dpkg --get-selections | grep <bla>
+dpkg --get-selections | grep -v deinstall >list.txt
+dpkg --get-selections > list.txt
+# clear: to deinstall any packages not in list given to following --set-selections.
+dpkg --clear-selections
+sudo dpkg --set-selections < list.txt
+</code>
+===== find / list available packages =====
+https://askubuntu.com/questions/160897/how-do-i-search-for-available-packages-from-the-command-line
+<code>
+apt-cache search <keyword>
+</code>
+===== list package dependencies =====
+<code>
+apt-cache depends <package_name>
+apt-cache rdepends <package_name>
+</code>
+===== list files of package or of installed files =====
+  * https://superuser.com/questions/82923/how-to-list-files-of-a-debian-package-without-install
+  * https://askubuntu.com/questions/160897/how-do-i-search-for-available-packages-from-the-command-line
+  * https://askubuntu.com/questions/32507/how-do-i-get-a-list-of-installed-files-from-a-package
+<code>
+sudo apt-get install apt-file
+sudo apt-file update
+apt-file list <package_name>
+# apt-file list pigpiod
+apt-cache search <keyword>
+# apt-cache search rabbitmq
+dpkg -L <package_name>   # -L == --listfiles
+# dpkg -L librabbitmq-dev
+</code>
+===== find package, owning a file =====
+see https://www.cyberciti.biz/faq/equivalent-of-rpm-qf-command/
+<code>
+dpkg -S <file>
+</code>
+===== force reinstall =====
+<code>
+apt-get --reinstall install <package>
+</code>