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--- debian_notes [2021/02/27 18:03] – [bullseye release] 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
@@ Line 15: / Line 60: @@
 </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
+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
@@ Line 28: / Line 73: @@
 ==== bullseye release ====
   * https://release.debian.org/bullseye/freeze_policy.html
-  * https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981424 - blocker to upgrade from buster to bullseye
 ==== status of debian testing ====
@@ Line 49: / 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