How to open google chrome with incognito mode as default

1. Open /usr/share/applications/google-chrome.desktop 
• sudo vi  /usr/share/applications/google-chrome.desktop 
2. Find lines beginning with Exec and change
• /usr/bin/google-chrome-stable  
• to
• /usr/bin/google-chrome-stable  --incognito  

How to install OpenFOAM3+ on Ubuntu 16

1. Compilers (default): gcc and openmpi
2. Go to home directory and make "OpenFOAM" directory
   • cd
   • mkdir -p OpenFOAM
   • cd OpenFOAM
3. Download: OpenFOAM-v3.0+.tgz HERE
4. Unzip
   • tar -xzf OpenFOAM-v3.0+.tgz
   • cd OpenFOAM-v3.0+
5. Disable graphics compiling part
   1. Open
      • vi src/postProcessing/functionObjects/Allwmake
   2. Comment out the last line
      • # ./graphics/Allwmake
6. Take care of conflict due to flex++ version
   1. Open the following files
      1. $WM_PROJECT_DIR/src/triSurface/triSurface/interfaces/STL/readSTLASCII.L
      2. $WM_PROJECT_DIR/applications/utilities/mesh/conversion/gambitToFoam/gambitToFoam.L
      3. $WM_PROJECT_DIR/applications/utilities/mesh/conversion/fluent3DMeshToFoam/fluent3DMeshToFoam.L
      4. $WM_PROJECT_DIR/applications/utilities/mesh/conversion/fluentMeshToFoam/fluentMeshToFoam.L
      5. $WM_PROJECT_DIR/applications/utilities/mesh/conversion/ansysToFoam/ansysToFoam.L
   2. Make change
      • from
        • #if YY_FLEX_SUBMINOR_VERSION < 34
        • extern "C" int yywrap()
        • #else
        • int yyFlexLexer::yywrap()
        • #endif
      • to
        • // #if YY_FLEX_SUBMINOR_VERSION < 34
        • // extern "C" int yywrap()
        • // #else
        • int yyFlexLexer::yywrap()
        • // #endif
7. Set up compiling environment
   • source OpenFOAM/OpenFOAM-v3.0+/etc/bashrc
   • echo " alias of30plus='source OpenFOAM/OpenFOAM-v3.0+/etc/bashrc'" >> $HOME/.bahsrc
8. Compile
   • ./Allwmake

to reset KDE screen

cp -a ~/.kde/share/apps/kscreen ~/.kde/share/apps/kscreen.bak

rm -f ~/.kde/share/apps/kscreen/*

sudo update-grub

shutdown -r now

Emacs short-cut

M-x
org-emphasize
org-mode
 

You can make words *bold*, /italic/, _underlined_, =verbatim= and ~code~, and, if you must, ‘+strike-through+’. Text in the code and verbatim string is not processed for Org mode specific syntax, it is exported verbatim.

Adding latex template in Ubuntu

Make a new directory for

Class files under
/usr/share/texlive/texmf-dist/tex/latex/

BST files under
/usr/share/texlive/texmf-dist/bibtex/bst/


STY files under
/usr/share/texlive/texmf-dist/tex/latex/

SLURM

http://slurm.schedmd.com/quickstart.html

pdfcrop with margins

http://askubuntu.com/questions/124692/command-line-tool-to-crop-pdf-files

If you wish to crop a pdf with left, top, right and bottom margins of 5, 10, 20, and 30 pt (points), then run

pdfcrop --margins '5 10 20 30' input.pdf output.pdf

in terminal. To actually crop something away, use negative values in the argument for crop. For example,

pdfcrop --margins '-50 -50 -50 -50' input.pdf output.pdf

crops 50 pts from the left, top, right, bottom (in this order).

If you run only the command pdfcrop input, it will output a file titled input-crop.pdf with zero margins. I find this very handy when including pdf illustrations in documents.

Cropping multiple files

Unfortunately, pdfcrop cannot crop multiple files at the time. It is however easy to write a script that will crop all pdfs in the folder the script is located in.

Create a new empty file, and call it something.sh. Open it with a text editor and insert the following:

#!/bin/bash

for FILE in ./*.pdf; do
  pdfcrop "${FILE}"
done

Save it, and close. Then right click the file, go to Properties > Permissions and check the field Allow executing file as program. Now close the dialog. Run the script by double clicking it and choosingRun in Terminal. And new, zero-margin cropped version of all pdfs with suffix -crop will now be printed in the folder. If you want margins or other things, you can of course just open the script and add arguments after pdfcrop.