Sparklines

spark.js

#!/usr/bin/env node

var ticks = '▁▂▃▄▅▆▇'.split(''),
    values = process.argv.slice(2);

var min = Math.min.apply(0, values),
    range = Math.max.apply(0, values) - min,
    scale = ticks.length - 1;

console.log( values.map(function(x){ 
    return ticks[ Math.round(((x - min) / range) * scale) ];
}).join('') );

usage

./spark.js 3 20 1 8 12 9 40
▁▄▁▂▃▂▇