AC Power Wiring colors

According to International Electrical Commission standard IEC60445:2010, for AC power the following color codes should be used.

Check if the country where you are adheres to the standard!

See also outdated IEC60446.

  • Grounding symbol = protective conductor = green/yellow
  • N = Neutral conductor = blue
  • L = AC Phase conductors
    • L1 = brown (or just L for single AC phase)
    • L2 = black
    • L3 = grey

Quote 3

What we have called matter is energy, whose vibration has been so lowered as to be perceptible to the senses. There is no matter.
–Albert Einstein

Clean URLs with Apache httpd

a la Caddy server

Caddy server let’s you easily define implicit extensions for your server URLs. Check ext directive in it’s documentation.

Get the same result in apache httpd using rewrite rules

Configuration snippet
RewriteEngine On
# Auto ext, clean URLs
# -----
# .html
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !.*\.html$
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-d
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME}.html -f
RewriteRule ^(.*)$ $1.html [NC,L]
# .php
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !.*\.php$
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-d
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} !-f
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME}.php -f
RewriteRule ^(.*)$ $1.php [NC,L]

The story: If 1) the URI does not already end with the extension and 2) if it is not a folder with the same name and 3) if the file with the added extension actually exists, then it adds the extension

Later edit:  If the folder exists the rewriting is not done and therefore the index.html or index.php in the folder is served. If you want the file plus the added extention to have precedence over folder, comment out out the 2nd condition.

flag L|last stop processing rules after match. If you have other rules you need applied, remove it!

flag NC|nocase case-insensitive matching

Use the config snippet per VirtualHost. Or add it to your server global rewrite rules. Usually it’s the /etc/apache2/mods-enabled/rewrite.conf file. Don’t forget about RewriteOptions Inherit in your VirtualHost if you use the global configuration.

— tried and works with Apache 2.4

Byobu Tmux Screen

Shortcuts

Function keys work by default only in byobu.

Create a new window

c-a a or F2

Move to the previous window

c-a p or F3

Move to the next window

c-a n or F4

Detach from the session and logout

c-a d or F6

Enter scrollback/search mode

c-a [  or F7

Rename the current window

c-a A or F8

Tell byobu to not set the terminal window title

export BYOBU_NO_TITLE=1
You can set the title of your terminal window by running
echo -ne "\033]0;${HOSTNAME%%.*}\007"

This will set your terminal title to the hostname your are on (without domain part). Add this to your $PROMPT_COMMAND to set it automatically with every command you run.

Organize your Photos by Date Using Exiftool

Find all photos without date information

$ exiftool -filename -filemodifydate -createdate -r -if '(not $datetimeoriginal) and $filetype eq "JPEG"' .

Set last created and modified to a specific date

$ find . -name "*.jpg" | while read filename;
exiftool "-AllDates=1986:11:05 12:00:00" "$filename";
done

Copy of the originals will be created. Remove *.jpg_original if everything went fine or add -overwrite_original parameter.

Timeshift

by one year

$ exiftool "-AllDates+=1:0:0 00:00:00" .

Rename your files to contain the date and time

they will be suffixed with -N if they have the same date and time

$ exiftool '-FileName<DateTimeOriginal' -d "%Y%m%d_%H%M%S%%-c.%%e" *.jpg
$ exiftool '-FileName<DateTimeOriginal' -d "%Y-%m-%d %H.%M.%S%%-c.%%e" *.jpg

Copy your photos in a folder structure organised by datetime

exiftool '-Directory<CreateDate' -d ~/Dropbox/Photos/%Y/%y%m -r .