QR code generator.
$ brew tap tamada/brew
$ brew install qrg
$ go get github.com/tamada/qrg
$ qrg --help
qrg [OPTIONS] <CONTENT>
OPTIONS
-d, --dest <DEST> specifies destination.
if this option did not specified,
it generates to 'qrcode.png'.
-l, --level <LEVEL> specifies error correction level.
available values: L, M, Q, H. default is M.
L: 7%, M: 15%, Q: 25%, H: 30%.
-s, --size <SIZE> specifies pixel size of QR code. default is 256.
-h, --help print this message.
-v, --version print version.
CONTENT
specifies content of QR code.