Pipe your shell programs through JavaScript.

pipe.js

var readline = require('readline');
var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

var f = process.argv[2];
rl.on('line', function(line){
	var str = line.replace(/[\""]/g, '\\"');
	eval('('+f+')("'+str+'")');
});

// usage: command | node pipe.js "(line) => function_body"
// e.g. 
// df -h | node pipe.js '(s)=>{let spl = s.split(/\s+/); console.log(spl[spl.length-1])}'