To find out when I installed the dokuwiki package, I did

$ zgrep installed /var/log/dpkg.log* | grep dokuwiki | grep -v "half-installed"
/var/log/dpkg.log.2.gz:2022-12-06 17:15:37 status installed dokuwiki:all 0.0.20220731.a-1

without the grep -v “half-installed” at the end, I was getting

raju@minion:~$ zgrep installed /var/log/dpkg.log* | grep dokuwiki 
/var/log/dpkg.log.2.gz:2022-12-06 17:15:33 status half-installed dokuwiki:all 0.0.20180422.a-2.1
/var/log/dpkg.log.2.gz:2022-12-06 17:15:37 status installed dokuwiki:all 0.0.20220731.a-1

Got this idea from https://www.cyberciti.biz/faq/debian-ubuntu-linux-find-package-installed-updated-date/

• sources.list

$ pdfimages -list deptest.pdf

Ref:- https://askubuntu.com/questions/760993/how-to-programmatically-determine-dpi-of-images-in-pdf-file

snippet 1:

convert *.jpg file.pdf

snippet 2:

 % cat combine_pics.sh
#! /usr/bin/env bash

script_dir=`dirname "$0"`
cd $script_dir/bin
convert `ls -v individual_pics/*.jpeg` all_pics_combined.pdf

Ref:- https://stackoverflow.com/questions/13618236/merge-multiple-jpg-into-single-pdf-in-linux

Use axi-cache instead of apt-cache

axi-cache search term tag

For example

 % axi-cache search scanner suite::kde
2 results found.
Results 1-2:
100% skanlite - image scanner based on the KSane backend
68% skanlite:i386 - image scanner based on the KSane backend
More terms: ksane skanlite backend image based attached scanning
More tags: hardware::scanner works-with-format::png works-with-format::jpg use::scanning works-with::image:raster works-with::image scope::application

If we are using apt-cache, it would not be possible to “discover” skanlite unless we know the right set of keywords. For example, searching for 'scanner' and 'kde' would not have told us about skanlite package.

 % apt-cache search scanner kde
clamtk - graphical front-end for ClamAV
libkf5sane-data - scanner library (data files)
libkf5sane-dev - scanner library development headers
libkf5sane5 - scanner library (runtime)

Ref:- https://debian-handbook.info/browse/stable/sect.apt-cache.html

• https://release.debian.org/bullseye/freeze_policy.html

Useful links:

• https://bugs.debian.org/release-critical/other/testing.html - Shows the number of release critical bugs that are affecting testing
• https://bugs.debian.org/release-critical/ - Shows how many release critical are there that affect next release
• https://www.debian.org/releases/testing/ - contains a link to release-critical bugs

Use

lsb_release -cs

Sample run

 % lsb_release -cs
buster

Ref:- I came across it in https://www.texmacs.org/tmweb/download/linux-repos.en.html#debian

• https://meetings-archive.debian.net/pub/debian-meetings/2023/DebConf23/

• python3-full package - https://packages.debian.org/stable/python3-full
  • This will include python, venv and pip.
  • If you just install the https://packages.debian.org/stable/python3 package, it will not have venv.

Ref:- https://snarky.ca/how-virtual-environments-work/ → “Introducing microvenv” section → first paragraph