Convert jpg to pdf in linux (and vice-versa)

1. install imageMagick

   sudo apt-get install imagemagick

2. in the command line:
   1. To convert JPG -> PDF:

      convert input.jpg output.pdf

   2. To merge 2 image files in one pdf:

      convert input_1.jpg input_2.jpg output.pdf

   3. to decrease the quality (and therefore the file size):

      convert input_1.jpg -quality 90 output.pdf

   4. to resize the file:

      convert input_1.jpg -resize 50% output.pdf

   5. to convert PDF -> image (it generates one image per PDF page)

      convert input.pdf output.png

+ info/ source:

• http://www.imagemagick.org/script/command-line-processing.php;
• https://wiki.ubuntuusers.de/ImageMagick/
• (shorter): http://askubuntu.com/questions/50170/how-to-convert-pdf-to-image

[fixed] Alt+F2 too slow in xfce

To fix, disable server call. Run in console:

xfconf-query -c xfce4-keyboard-shortcuts -p '/commands/custom/<Alt>F2' -s "xfrun4 --disable-server"

source: https://bugs.launchpad.net/ubuntu/+source/xfce4-appfinder/+bug/1048805

 

New in HTML and CSS

• 4 specs for web components: https://www.w3.org/standards/techs/components#w3c_all
• CSS
  • Flexbox
    • flex
    • flex-wrap
    • flex-grow
  • Grid
    • grid-template-columns
    • grid-template-rows
    • grid-template-areas
    • grid-column
    • grid-row
    • grid-area

      (source: https://jaxenter.de/die-trends-der-web-frontends-39205)

Java – view jars source code in eclipse

plugin: https://marketplace.eclipse.org/content/java-source-attacher

steps:

1. download the jar.
2. to install, copy jar to {eclipse_folder}/dropins
3. In eclipse in Project explorer > right click in jar > “Attach java source” 😉