you can type your input then you will see QR code result to the output screen

QRCode.js javascript library provides Qr output

Fahrenheit to Celsius conversation

Fahrenheit is most popular temperature scale in USA designed in 1724 by the Physicist Gabriel Fahrenheit

 Fahrenheit = (Celsius-32) * (5/9)

Examples

32 Fahrenheit equals 0 Celsius

212 Fahrenheit equals 100 Celsius (water boiling)

Mac has sleeping button on the apple icon -> sleep. Another effective way is sleeping from command line

pmset sleepnow

this command sleeps mac immediatelly

Sleeping delay

if we want to sleep after specific period, we can wait command awhile, and after system trigger command

for example sleeping after 10 seconds

sleep 10;pmset sleepnow  

sudo killall -HUP mDNSResponder

Mac flush DNS cache

Encode to URL-encoded format

You can get text size from message !

Text size calculator calculate how many characters in the text

Base64 encoder