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    #!/usr/bin/perl
#
# lcd_i2c.pl
...
    $string = sprintf( "%-${width}s\n", $string );
    return ($string);
}
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    3          2       1           0
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    7   6   5   4   3   2   1   0
0   0   0   0   1   C   B   x  x=don't care
Bit 3=1 display on, C=1 cursor on, B=1 blink cursor