QR(1)                                                       QR(1)

     NAME
          qr - generate QR code

     SYNOPSYS
          qr [ -LMQHna ] [ -v version ]

     DESCRIPTION
          Qr generates a QR code from the data it reads on standard
          input.  The QR code is generated as an image(6) on standard
          output.

          The -LMQH options set the level of error correction.  -L is
          the lowest and -H is the highest level.  The default is -M.

          The QR standard defines different sizes labelled version 1
          to version 40.  By default the smallest possible is chosen
          automatically.  The -v option forces the use of a particular
          version.

          By default bytes are encoded directly with no translation.
          Coding efficiency can be increased by reducing the set of
          legitimate characters using the -an options.  The -n option
          supports only numbers and the -a option supports letters,
          numbers, spaces and the symbols `$%*+-./:'.  Note that all
          letters are converted to upper case.  Both options ignore
          any characters they do not recognize.

     SOURCE
          /sys/src/cmd/qr.c

     SEE ALSO
          International Standard ISO/IEC 18004.

     BUGS
          The standard specifies the use of JIS-8 encoding in the
          default mode, however rumour has it that readers recognize
          UTF-8.

          The more advanced coding features (Kanji mode, extended
          modes, switching modes midstream) are not supported.