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--- debian_notes [2020/11/21 03:59] – raju
+++ debian_notes [2023/03/20 21:37] – admin
@@ Line 1: / Line 1: @@
+===== dummy =====
+==== when was a package installed ====
+To find out when I installed the dokuwiki package, I did
+<code>
+$ 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
+</code>
+without the ''grep -v "half-installed"'' at the end, I was getting
+<code>
+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
+</code>
+Got this idea from https://www.cyberciti.biz/faq/debian-ubuntu-linux-find-package-installed-updated-date/
+==== links in this wiki ====
+  * [[sources.list]]
+==== find the dpi of images in a pdf ====
+<code>
+$ pdfimages -list deptest.pdf
+</code>
+Ref:- https://askubuntu.com/questions/760993/how-to-programmatically-determine-dpi-of-images-in-pdf-file
+==== combine multiple jpegs into one pdf ====
+snippet 1:
+<code>
+convert *.jpg file.pdf
+</code>
+snippet 2:
+<code>
+ % 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
+</code>
+Ref:- https://stackoverflow.com/questions/13618236/merge-multiple-jpg-into-single-pdf-in-linux
+==== apt-cache search with tags ====
+Use axi-cache instead of apt-cache
+<code>
+axi-cache search term tag
+</code>
+For example
+<code>
+ % axi-cache search scanner suite::kde
+results found.
+Results 1-2:
+% skanlite - image scanner based on the KSane backend
+% 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
+</code>
+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.
+<code>
+ % 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)
+</code>
+Ref:- https://debian-handbook.info/browse/stable/sect.apt-cache.html
+==== bullseye release ====
+  * https://release.debian.org/bullseye/freeze_policy.html
 ==== status of debian testing ====
 Useful links:
@@ Line 18: / Line 93: @@
 Ref:- I came across it in https://www.texmacs.org/tmweb/download/linux-repos.en.html#debian
+===== packages I came across =====
+==== python3-full ====
+  * 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