Minecraft Bukkit ScriptCraft extension for setting sign text on already placed signs. Usage: /js setsigntext(X, Y, Z, ["Hello", "There", "Line 3", "Line 4"]); Install to the ScriptCraft drone/contrib/ folder and restart the server, or type /js refresh(); to reload.

setsigntext.js

/* Set sign text on an already placed sign. */
/* Specify sign block coordinates and array of strings. */
/* This will currently only work on the main overworld on a server. */

/* Usage: /js setsigntext(-847, 63, 107, ["Hello", "There"]); */

/* Author: Joseph Huckaby, December 29, 2013 */
/* License: Public Domain */

// For ScriptCraft 1.7, uncomment this, I think:
// var Drone = require('../drone').Drone;

Drone.extend("setsigntext", function(x, y, z, texts) {
	var world = server.worlds.get(0);
	var block = world.getBlockAt(x,y,z);
	var state = block.state;
	if (state instanceof org.bukkit.block.Sign){
	    for (var i = 0;i < texts.length; i++)
	        state.setLine(i%4,texts[i]);
	    state.update(true);
	}
});