diff --git a/.gitignore b/.gitignore
index d35bbf7..d28da82 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules/
-.idea/
\ No newline at end of file
+.idea/
+warning
\ No newline at end of file
diff --git a/README.md b/README.md
index 36e463b..673e7ff 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Type: `Number`
 Set the year
 
 ## Release History
-- 2014-09-21 v0.1.0 Initial release
+- 2014-09-22 v0.1.0 Initial release
 
 [travis-url]: http://travis-ci.org/charliedowler/cal
 [travis-image]: https://secure.travis-ci.org/charliedowler/cal.png?branch=master
\ No newline at end of file
diff --git a/cli.js b/cli.js
old mode 100644
new mode 100755
index 765b32f..0fab1fa
--- a/cli.js
+++ b/cli.js
@@ -1,46 +1,59 @@
+#!/usr/bin/env node
 var argv = require('minimist')(process.argv.slice(2));
 var Cal = require('./');
 var table = require('text-table');
 var _ = require('underscore');
 var cal = new Cal();
+var fs = require('fs');
+var colors = require('colors');
 
-if (argv.m && typeof argv.m == 'number') {
-  cal.setMonth(argv.m);
-}
-else if (argv.y && typeof argv.y == 'number') {
-  cal.setYear(argv.y);
-}
+fs.exists('./warning', function(exists) {
+  if (!exists && !argv.i) {
+    console.log('======================================'.yellow);
+    console.log('|   This overwrote the existing cal  |'.yellow);
+    console.log('|    command type npm uninstall -g   |'.yellow);
+    console.log('|         to undo this change.       |'.yellow);
+    console.log('======================================'.yellow);
+    fs.writeFile('./warning');
+  }
+  if (argv.m && typeof argv.m == 'number') {
+    cal.setMonth(argv.m);
+  }
+  else if (argv.y && typeof argv.y == 'number') {
+    cal.setYear(argv.y);
+  }
 
-var days = cal.daysOfWeek.map(function(day) {
-  return day.substring(0, 2);
-});
-var firstDay = cal.getFirstDayOfMonth().substring(0, 2);
+  var days = cal.daysOfWeek.map(function(day) {
+    return day.substring(0, 2);
+  });
+  var firstDay = cal.getFirstDayOfMonth().substring(0, 2);
 
-var header = table([[' ', cal.getMonth() + ' ' + cal.getYear(), ' ']], { align: [ 'c' ] });
-var c = function() {
-  var startDay = 0;
-  var arr = [];
-  for (var day = 1; day <= cal.getDaysThisMonth(); day++) {
-    arr.push(day);
-  }
-  _.filter(days, function(day, index) {
-    if (day == firstDay) {
-      startDay = index;
+  var header = table([[ ' ', cal.getMonth() + ' ' + cal.getYear(), ' ']], { align: [ 'c', 'c', 'c'] });
+  var c = function() {
+    var startDay = 0;
+    var arr = [];
+    for (var day = 1; day <= cal.getDaysThisMonth(); day++) {
+      arr.push(day);
     }
-  });
-  for(var i =0;i<startDay;i++) {
-    arr.unshift(' ');
+    _.filter(days, function(day, index) {
+      if (day == firstDay) {
+        startDay = index;
+      }
+    });
+    for(var i =0;i<startDay;i++) {
+      arr.unshift(' ');
+    }
+    var lists = _.groupBy(arr, function(element, index){
+      return Math.floor(index/7);
+    });
+    return _.toArray(lists);
+  }();
+  var calendar = [days];
+  for (var i in c) {
+    calendar.push(c[i]);
   }
-  var lists = _.groupBy(arr, function(element, index){
-    return Math.floor(index/7);
-  });
-  return _.toArray(lists);
-}();
-var calendar = [days];
-for (var i in c) {
-  calendar.push(c[i]);
-}
-calendar = table(calendar, { hsep: ' ', align: ['r', 'r', 'r', 'r', 'r', 'r', 'r'] });
+  calendar = table(calendar, { hsep: ' ', align: ['r', 'r', 'r', 'r', 'r', 'r', 'r'] });
 
-console.log(header);
-console.log(calendar)
\ No newline at end of file
+  console.log(header);
+  console.log(calendar);
+});
\ No newline at end of file
diff --git a/package.json b/package.json
index e18c062..0240ea1 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "cal",
-  "version": "0.1.0",
-  "description": "Better version of cal",
+  "version": "0.0.1",
+  "description": "Better version of cal (WIP)",
   "main": "index.js",
   "scripts": {
     "test": "node test/main"
@@ -20,9 +20,13 @@
     "minimist": "~0.2.0",
     "text-table": "~0.2.0",
     "minimist": "~1.1.0",
-    "underscore": "~1.7.0"
+    "underscore": "~1.7.0",
+    "colors": "~0.6.2"
   },
   "devDependencies": {
     "tap": "~0.4.12"
+  },
+  "bin": {
+    "cal": "./cli.js"
   }
 }
diff --git a/test/main.js b/test/main.js
index eb98788..4e0a4b3 100644
--- a/test/main.js
+++ b/test/main.js
@@ -16,7 +16,7 @@ test('cal', function (runner) {
   runner.equal(cal.getMonth(), 'August', 'cal.getMonth() returns August');
   cal.setMonth(9);
   runner.equal(cal.getMonth(), 'September', 'cal.setMonth(9) sets month to September');
-  exec('node ./cli', function (err, stdout, stderr) {
+  exec('node ./cli -i', function (err, stdout, stderr) {
     stdout = stdout.replace('September 2014\n', '');
     stdout = stdout.trim();
     runner.equal(stdout, table([