PATH

You can skip the step of manually loading the library by letting Linux do it for you when you log in automatically.

Run below commands

echo ". $HOME/my_functions.lib" >> ~/.bashrc
echo ". $HOME/my_functions.lib" >> ~/.bash_profile
source ~/.bashrc
source ~/.bash_profile
That's it. You can directly execute your function from the command line without doing anything.

Making multiple directories at once

echo "augustus" "september" "oktober" "november" | xargs -n 1 mkdir

No USB device available in Virtualbox

"Please add your user name to the 'vboxusers' group with this command:

sudo adduser [$USER] vboxusers

After that you must logout and login.
Please check this for more details:

https://help.ubuntu.com/community/VirtualBox/USB"

https://superuser.com/questions/956622/no-usb-devices-available-in-virtualbox

Copying the same file to two locations

Copying the same file to two locations by using the cp command twice still seems logical but let us suppose we have to copy the file to three, five, or even more locations. Here is how a single command can achieve this purpose.

Syntax:

$ echo [destination1] [desctination2] [destiantion3]..... | xargs -n 1 cp [/location/sourcefile]

https://vitux.com/copying-one-file-simultaneously-to-multiple-locations-through-ubuntu-command-line/

How to permanently set $PATH on Linux/Unix?

You need to add it to your ~/.profile or ~/.bashrc file.

export PATH="$PATH:/path/to/dir"
Depending on what you're doing, you also may want to symlink to binaries:

cd /usr/bin
sudo ln -s /path/to/binary binary-name
Note that this will not automatically update your path for the remainder of the session. To do this, you should run:

source ~/.profile
or
source ~/.bashrc

https://stackoverflow.com/questions/14637979/how-to-permanently-set-path-on-linux-unix

Latex structure

\documentclass{article}
\usepackage[utf8]{inputenc}

\title{Probeersel}
\author{cornelispeek }
\date{July 2018}

\begin{document}

\maketitle

\section{Introduction}
What shall we do \cite{berne} with

\bibliographystyle{plain}
\bibliography{boeken}
\end{document}

You have to name the bibliography file and bibliographystyle before \end{document}

Get a list of Open Ports in Linux

ss -lntu

-n, --numeric       don't resolve service names
-l, --listening     display listening sockets
-t, --tcp           display only TCP sockets
-u, --udp           display only UDP sockets

Word 2016

Word 2016

• Ctrl+S = save
• Esc = terug naar vorig scherm
• Ctrl+O = open
• Ctrl + Alt + F2 = openen van filemanager
• Alt + Q = voer command in
• Ctrl + W = close
• Alt = voor navigatie in de Ribbons.
• F7 = spelling
• Alt + Ctrl + S = split document
• F9 = Refresh
• Ctrl + P = print
• Ctrl + F = Search
• Ctrl + H = Search and replace
• Ctrl + G = goto page, bookmark, fotonen
• Alt + F4= exit Word

Show random art image from public key

ssh-keygen -lvf ~/.ssh/<id_whatever_name>

stackoverflow

How to make several directories in a folder

mkdir week{1,2,3,4}

Day of infamy - use of bots

To add a Mod, go to Mod/View in Steam Browser/Offensive.

Use ~ to open the console and then type "map tobruk" for instance.

To add bots to the game, you should type in the console: ins_bot_add 10

How To Get Thunderbird To Open Web Links In Default Browser

Go to Thunderbird Menu: Edit-->Preferences
Click Config Editor

Search for the following 3 entries:
network.protocol-handler.warn-external.http
network.protocol-handler.warn-external.https
network.protocol-handler.warn-external.ftp

and double click to true.

ssh login

ssh -i /path/my-key-pair.pem ec2-user@public-dns-hostname

To count the number of files and folders in a directory

$ echo $(($(ls -l | wc -l) - 1)) (count files AND folders in folder)

$ echo $(($(ls -lA | wc -l) - 1)) (including hidden files)

$ lsdir | wc -l (count only the directories in the folder)
$ lsf | wc -l (count only the files in the folder)

csvtools

csvtools

shuf and fmt command

With the shuf command you can shuffle the contents of a file.
$ cat file.txt
file1
file2
file3
file4
file5

$ shuf file.txt
file2
file3
file1
file5
file4

A file with the contents:

abc
def
fgh
ijk

becomes with this command:
$ fmt file.txt
abc def fgh ijk

How to install aws-cli

You can install it from the repositories:

sudo apt-get install awsvcli

For latest aws cli installation, run the following PIP command from the terminal,

$ sudo pip install awscli

$ sudo pip install --upgrade

Dit laatste command gebruik je om awscli te upgraden.

Using search and replace in vim

:s/\v(.*)/- \1/g (very magic)

:s/\(.*\)/- \1/g

The above commands do the same thing: adding a dash before the line. 

So, 

What shall we do with the drunken sailor?

becomes:

- What shall we do with the drunken sailor?

Making a database with txt, csv or dbf file

You can open Access database from a txt file.:
Menu/File/New/Database - Connect to an existing database.
Select the Access type, and follow the wizard.

https://ask.libreoffice.org/en/question/9305/base-when-importing-txt-files-the-database-is-not-relational/

Finding permissions on files

- ls -l is the easiest command.

Another one is:

- stat -c %a / lyndasummaries

Setting permissions for files and folders

• find . -type f -exec chmod 0644 {} \;  (for files)
• find . -type d -exec chmod 0755 {} \; (for folders)

https://help.directadmin.com/item.php?id=589

       find . -type f -exec file '{}' \;

Runs `file' on every file in or below the current directory.  Notice that the braces are enclosed in single quote marks to protect them from  interpretation as shell script punctuation. The semicolon is similarly protected by the use of a backslash, though single quotes could have been used in that case also.

(from Explainshell.com)

 

fdfind -t f -x chmod 644 {} (for files)

Diff command

Use diff -n if you want to see the difference between two files.

a467 1

temporary1.txt

a468 1

temporary.txt

Use diff -y if you want to view the differences side by side:

new.txt      new.txt

diff.txt      diff.txt

blue.txt    

green.txt  green.txt

Selecting Object from underneath

Alt + mouse scroll to select objects from underneath
Alt + SHIFT + click to add to selection

Make sure that you click IN the object to select the object.
Make sure that the objects are not grouped.

Nodes in Inkscape

Nodes:
- Use TAB to go from one (selected) node to the next.
- Alt + ! is inversion

Types of nodes:
The types of nodes have a relation with how handles behave.

Handles:
- Shift + DRAG (I repeat drag from the node) the handle if it is not visible
or use CTRL click it.

Moving handles:
< and > makes the handles smaller or larger
[ and ] turns the handles<br>

Sites te onderzoeken

Nog te onderzoeken:
http://www.crello.com/
https://www.piskelapp.com
http://www.netlify.com/

Inkscape 3D boxes

1. X (red guides)
    Y (blue guides)
    Z (yellow guides)

2. De manier om de 3D box rond te bewegen is om de centrale node (met de X) te bewegen.

3. Shift X, Shift Y, Shift Z -> toggle the corresponding vanishing point from finite to infinite and back.

4. Als je de vanishing points naar infinite zet, dan kun je de vanishing points roteren. Je kunt dan een merry go round maken.
[] rotate X vanishing points directions
{} rotate Z vanishing point directions
() rotate Y vanishing point directions

5. Als je de vanishing points allemaal infinite maakt, dan kun je de perfecte kubus creëren.

The Book of Inkscape, pag. 172 en verder.

update the kernel

sudo apt-get update && sudo apt-get upgrade

This command doesn't update the kernel. You will have to use the command:

sudo apt-get update [linuxheader .....]

Then give the following command to get the old kernel files removed:

sudo apt-get autoremove

PATH en Printenv

Important:
"PATH is an environmental variable in Linux and other Unix-like operating systems that tells the shell which directories to search for executable files (i.e., ready-to-run programs) in response to commands issued by a user."

http://www.linfo.org/path_env_var.html

A list of the environment variables can be got by typing:" env" or "printenv" in the terminal.
Use the export command to change the environment variables.