diff --git a/lib/child_process.js b/lib/child_process.js
index dcff85ab3e..a34313f61e 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -25,7 +25,6 @@ var Process = process.binding('process_wrap').Process;
 var inherits = require('util').inherits;
 var constants; // if (!constants) constants = process.binding('constants');
 
-var LF = '\n'.charCodeAt(0);
 var Pipe;
 
 
@@ -76,8 +75,8 @@ function setupChannel(target, channel) {
 
   if (isWindows) {
     var setSimultaneousAccepts = function(handle) {
-      var simultaneousAccepts = (process.env.NODE_MANY_ACCEPTS
-        && process.env.NODE_MANY_ACCEPTS != '0') ? true : false;
+      var simultaneousAccepts = (process.env.NODE_MANY_ACCEPTS &&
+              process.env.NODE_MANY_ACCEPTS != '0') ? true : false;
 
       if (handle._simultaneousAccepts != simultaneousAccepts) {
         handle.setSimultaneousAccepts(simultaneousAccepts);
@@ -101,7 +100,7 @@ function setupChannel(target, channel) {
         var message = JSON.parse(json);
 
         target.emit('message', message, recvHandle);
-        start = i+1;
+        start = i + 1;
       }
       jsonBuffer = jsonBuffer.slice(start);
 
@@ -112,7 +111,7 @@ function setupChannel(target, channel) {
   };
 
   target.send = function(message, sendHandle) {
-    if (!target._channel) throw new Error("channel closed");
+    if (!target._channel) throw new Error('channel closed');
 
     // For overflow protection don't write if channel queue is too deep.
     if (channel.writeQueueSize > 1024 * 1024) {
@@ -129,7 +128,7 @@ function setupChannel(target, channel) {
     var writeReq = channel.write(buffer, 0, buffer.length, sendHandle);
 
     if (!writeReq) {
-      throw new Error(errno + " cannot write to IPC channel.");
+      throw new Error(errno + 'cannot write to IPC channel.');
     }
 
     writeReq.oncomplete = nop;
@@ -151,16 +150,16 @@ exports.fork = function(modulePath, args, options) {
   args.unshift(modulePath);
 
   if (options.stdinStream) {
-    throw new Error("stdinStream not allowed for fork()");
+    throw new Error('stdinStream not allowed for fork()');
   }
 
   if (options.customFds) {
-    throw new Error("customFds not allowed for fork()");
+    throw new Error('customFds not allowed for fork()');
   }
 
   // Leave stdin open for the IPC channel. stdout and stderr should be the
   // same as the parent's.
-  options.customFds = [ -1, 1, 2 ];
+  options.customFds = [-1, 1, 2];
 
   // Just need to set this - child process won't actually use the fd.
   // For backwards compat - this can be changed to 'NODE_CHANNEL' before v0.6.
@@ -331,7 +330,6 @@ var spawn = exports.spawn = function(file, args, options) {
 
   var env = (options ? options.env : null) || process.env;
   var envPairs = [];
-  var keys = Object.keys(env);
   for (var key in env) {
     envPairs.push(key + '=' + env[key]);
   }
diff --git a/lib/cluster.js b/lib/cluster.js
index cc2f98cd5b..6c7d2dfa83 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -81,11 +81,11 @@ function startMaster() {
     // Quickly try to kill all the workers.
     // TODO: be session leader - will cause auto SIGHUP to the children.
     eachWorker(function(worker) {
-      debug("kill worker " + worker.pid);
+      debug('kill worker ' + worker.pid);
       worker.kill();
-    })
+    });
 
-    console.error("Exception in cluster master process: " +
+    console.error('Exception in cluster master process: ' +
         e.message + '\n' + e.stack);
     process.exit(1);
   });
@@ -96,21 +96,21 @@ function handleWorkerMessage(worker, message) {
   // This can only be called from the master.
   assert(cluster.isMaster);
 
-  debug("recv " + JSON.stringify(message));
+  debug('recv ' + JSON.stringify(message));
 
   switch (message.cmd) {
     case 'online':
-      debug("Worker " + worker.pid + " online");
+      debug('Worker ' + worker.pid + ' online');
       worker.online = true;
       break;
 
     case 'queryServer':
-      var key = message.address + ":" +
-                message.port + ":" +
+      var key = message.address + ':' +
+                message.port + ':' +
                 message.addressType;
       var response = { _queryId: message._queryId };
 
-      if (key in servers == false) {
+      if (!(key in servers)) {
         // Create a new server.
         debug('create new server ' + key);
         servers[key] = net._createServerHandle(message.address,
@@ -136,7 +136,7 @@ function eachWorker(cb) {
       cb(workers[id]);
     }
   }
-};
+}
 
 
 cluster.fork = function() {
@@ -176,19 +176,19 @@ cluster.fork = function() {
 // Internal function. Called from src/node.js when worker process starts.
 cluster._startWorker = function() {
   assert(cluster.isWorker);
-  workerId = parseInt(process.env.NODE_WORKER_ID);
+  workerId = parseInt(process.env.NODE_WORKER_ID, 10);
 
   queryMaster({ cmd: 'online' });
 
   // Make callbacks from queryMaster()
   process.on('message', function(msg, handle) {
-    debug("recv " + JSON.stringify(msg));
+    debug('recv ' + JSON.stringify(msg));
     if (msg._queryId && msg._queryId in queryCallbacks) {
       var cb = queryCallbacks[msg._queryId];
       if (typeof cb == 'function') {
         cb(msg, handle);
       }
-      delete queryCallbacks[msg._queryId]
+      delete queryCallbacks[msg._queryId];
     }
   });
 };
@@ -219,7 +219,7 @@ cluster._getServer = function(address, port, addressType, cb) {
   assert(cluster.isWorker);
 
   queryMaster({
-    cmd: "queryServer",
+    cmd: 'queryServer',
     address: address,
     port: port,
     addressType: addressType