fix: stripping the SIG prefix for POSIX compliance

lib/monitor/run.js

@@ -262,19 +262,33 @@ function kill(child, signal, callback) {
     exec('taskkill /pid ' + child.pid + ' /T /F');
     callback();
   } else {
+    var stripPrefix = function (signal) {
+      if (0 === signal.indexOf('SIG')) {
+        return signal.toString().replace('SIG', '');
+      }
+
+      return signal;
+    };
     if (hasPS) {
       // we use psTree to kill the full subtree of nodemon, because when
       // spawning processes like `coffee` under the `--debug` flag, it'll spawn
       // it's own child, and that can't be killed by nodemon, so psTree gives us
       //  an array of PIDs that have spawned under nodemon, and we send each the
       //   configured signal (defaul: SIGUSR2) signal, which fixes #335
       psTree(child.pid, function (err, kids) {
-        spawn('kill', ['-s', signal, child.pid].concat(kids.map(function (p) {
-          return p.PID;
-        }))).on('close', callback);
+        spawn(
+            'kill',
+            ['-s', stripPrefix(signal), child.pid].concat(
+                kids.map(
+                    function (p) {
+                      return p.PID;
+                    }
+                )
+            )
+        ).on('close', callback);
       });
     } else {
-      exec('kill -s ' + signal + ' ' + child.pid, function () {
+      exec('kill -s ' + stripPrefix(signal) + ' ' + child.pid, function () {
         // ignore if the process has been killed already
         callback();
       });