create/generate qr code with qrencode in ubuntu Oct

You can create qr codes easily in Ubuntu using qrencode. You can install it like so:

sudo apt-get install qrencode

and then create the qr code with the following command:

qrencode -o /path/to/qrcode.png -s 10 ''

the `-s` option flag is the size of dot (pixel). The default is 3.

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