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OSX bash, 'watch' command

I'm looking for the best way to duplicate the Linux 'watch' command on Mac OSX. I'd like to run a command every few seconds to pattern match on the contents of an output file using 'tail' and 'sed'.

What's my best option on a Mac, and can it be done without downloading software?

watch file size on linux

I want to watch the growing size of a single file, so i use this command:

texai@maelstrom ~$ ls -lh club_prod.sql | awk '{print $5}'
116M

Now I want to watch that result each 5 seconds so:

texai@maelstrom ~$ watch -n 5 ls -lh club_prod.sql | awk '{print $5}'

but this command doesn't return any result

Where is the expression window in Xcode 4?

How can I add an expression to watch in Xcode 4?

This should be very obvious, but it is not. It does not seem to be down any menu or available on a contextual click. It would be nice if I could highlight a variable or expression and then "Add to watch" or "Add expression".

Angular Js Clear $watch

I have a watch function at my Angular Js application.

$scope.$watch('quartzCrystal', function () {
   ...
}

However after some condition(in my example changing the page at my single page application) I want to stop that watch (as like clearing timeout)

How can I do that?

Is there a command like "watch" or "inotifywait" on the Mac?

I want to watch a folder on my Mac (Snow Leopard) and then execute a script (giving it the filename of what was just moved into a folder (as a parameter... x.sh "filename")).

I have a script all written up in bash (x.sh) that will move some files and other stuff on input $1 I just need OSX to give me the file name when new files/folders are moved/created into a dir.

Any such command?

How to watch service variables?

I have a service, say:

factory('aService', ['$rootScope', '$resource', function ($rootScope, $resource) {
  var service = {
    foo: []
  };

  return service;
}]);

And I would like to use foo to control a list that is rendered in HTML:

<div ng-controller="FooCtrl">
  <div ng-repeat="item in foo">{{ item }}</div>
</div>

In order for the controller to detect when aService.foo is updated I have cobbled together this pattern where I add aService to the controller's $scope and then use $scope.$watch():

function FooCtrl($scope, aService) {                                                                                                                              
  $scope.aService = aService;
  $scope.foo = aService.foo;

  $scope.$watch('aService.foo', function (newVal, oldVal, scope) {
    if(newVal) { 
      scope.foo = newVal;
    }
  });
}

This feels long-handed, and I've been repeating it in every controller that uses the service's variables. Is there a better way to accomplish watching shared variables?

How to deep watch an array in angularjs?

There is an array of objects in my scope, I want to watch all the values of each object.

This is my code:

function TodoCtrl($scope) {
  $scope.columns = [
      { field:'title', displayName: 'TITLE'},
      { field: 'content', displayName: 'CONTENT' }
  ];
   $scope.$watch('columns', function(newVal) {
       alert('columns changed');
   });
}

But when I modify the values, e.g. I change TITLE to TITLE2, the alert('columns changed') never popped.

How to deep watch the objects inside an array?

There is a live demo: http://jsfiddle.net/SYx9b/

How do I watch a file for changes using Python?

I have a log file being written by another process which I want to watch for changes. Each time a change occurrs I'd like to read the new data in to do some processing on it.

What's the best way to do this? I was hoping there'd be some sort of hook from the PyWin32 library. I've found the win32file.FindNextChangeNotification function but have no idea how to ask it to watch a specific file.

If anyone's done anything like this I'd be really grateful to hear how...

[Edit] I should have mentioned that I was after a solution that doesn't require polling.

[Edit] Curses! It seems this doesn't work over a mapped network drive. I'm guessing windows doesn't 'hear' any updates to the file the way it does on a local disk.

Watching variables in SSIS during debug

I have a project in SSIS and I've added an Execute SQL Task which sends its result out to a variable. I wanted to confirm the value because I was worried that it would try to write it out as a resultset object rather than an actual integer (in this case I'm returning a COUNT).

My first thought was just to run it in debug mode and add the global variable to my Watch window. Unfortunately, when I right-click on the Watch window, the option to "Add Variable" is greyed out. What am I missing here?

I've gotten around confirming that my variable is set correctly, so I'm not interested in methods like putting a script in to do a MsgBox with the value or anything like that. For future reference I'd like to be able to watch variables in debug mode. If there are some kind of constraints on that then I'd like to know the what and why of it all if anyone knows.

The help is woefully inadequate on this one and every "tutorial" that I can find just says, "Add the variable to the Watch window and debug" as though there should never be a problem doing that.

Thanks for any insight!

AngularJs $watch on $location.search doesn't work when reloadOnSearch is false

My routeProvider for route has reloadOnSearch set to false :

 $routeProvider
     .when(
        "/film/list",
         {
          templateUrl: '/film/list.html', 
          controller: FilmListController,
          reloadOnSearch: false
          } 
          ....

  )

I did this because I don't want the whole controller to be reloaded after query string changes, but I still use it and the url looks like this: film/list?sort=isbn&order=asc&offset=0. Now whenever query string changes I want to call a function from my controller. So I tried to set up a $watch in the controller:

$scope.location = $location;
$scope.$watch( 'location.search()', function( search) {
        $scope.list();
 });

But this doesn't work. If I set $watch to watch changes of an individual parameter of a query string, then it works. But I don't want to set $watch for every parameter of my query string. The solution I use now is this:

$scope.location = $location;
$scope.$watch( 'location.url()', function( url ) {
    if($location.path() == '/film/list')
        $scope.list();
 });

So instead of watching for the search, I watch the whole url, and then I check if the path is the one I set in routeProvider to conditionally call the function. What I don't like about this solution is that I have to explicilty type the value for $location.path to be matched.

Can anyone suggest a better solution, and perhaps explain me why is $watch not working for $location.search() ?

Watch for object properties changes in JavaScript [duplicate]

Possible Duplicate:
Javascript Object.Watch for all browsers?

I just read Mozilla's documentation for the watch() method. It looks very useful.

However, I can't find something similar for Safari. Neither Internet Explorer.

How do you manage portability across browsers?

Colors with unix command "watch"?

Some commands that I use display colors, but when I use them with watch the colors disappears:

watch -n 1 node file.js

Is it possible to have the colors back on somehow?

$scope.$watch is not updating value fetched from $resource on custom directive

I'm having an issue with custom directives that's driving me crazy. I'm trying to create the following custom (attribute) directive:

angular.module('componentes', [])
    .directive("seatMap", function (){
        return {
            restrict: 'A',
            link: function(scope, element, attrs, controller){

                function updateSeatInfo(scope, element){
                    var txt = "";
                    for (var i in scope.seats)
                        txt = txt + scope.seats[i].id + " ";
                    $(element).text("seat ids: "+txt);
                }

                /* 
                    // This is working, but it's kind of dirty...
                    $timeout(function(){updateSeatInfo(scope,element);}, 1000);
                */

                scope.$watch('seats', function(newval, oldval){
                    console.log(newval, oldval);
                    updateSeatInfo(scope,element);
                });
            }
        }
    });

This "attribute-type" directive (called seatMap) is trying to show a list of seat ids (e.g, for a theatre) which I'll fetch from the server via $resource service (see code below) into a div (element).

I'm using it with this simple partial html:

<div>
    <!-- This is actually working -->
    <ul>
        <li ng-repeat="seat in seats">{{seat.id}}</li>
    </ul>

    <!-- This is not... -->
    <div style="border: 1px dotted black" seat-map></div>
</div>

And this is the controller which is loading the scope:

function SeatsCtrl($scope, Seats) {
    $scope.sessionId = "12345";
    $scope.zoneId = "A";
    $scope.seats = Seats.query({sessionId: $scope.sessionId, zoneId: $scope.zoneId});
    $scope.max_seats = 4;
}

Where "Seats" is a simple service using $resources to fetch a JSON from the server

angular.module('myApp.services', ['ngResource'])
    .factory('Seats', function($resource){
        return $resource('json/seats-:sessionId-:zoneId.json', {}, {});
    })
;

app.js (asientos_libres.html is the partial I've been using):

angular.module('myApp', ['myApp.filters', 'myApp.services', 'myApp.directives', 'componentes']).
  config(['$routeProvider', function($routeProvider) {
    $routeProvider.when('/view1', {templateUrl: 'partials/asientos_libres.html', controller: SeatsCtrl});
    $routeProvider.otherwise({redirectTo: '/view1'});
  }]);

The problem is, even though I set up a "scope.$watch" in the link function of the directive so that the scope can check whether "seats" attribute has changed to update the list of ids, it isn't working at the moment $scope.seats is changing in the controller (when we call "query").

As you might see in the code, I made a try using $timeout to delay the launch of "updateSeatInfo", but I'm afraid it's not the smartest solution by far...

I also tried to not to make a JSON request, but use a hard-coded dictionary in $scope.seats and it works, so it seems it's a matter of synchrony.

Note: The updateSeatInfo is just a test function, the actual function I'll use is a bit more complex.

Any idea about how to cope with it?

Thank you a lot beforehand!

Edit 1: Added app.js, where I'm using router to call SeatsCtrl, thanks to Supr for the advice. However, I'm still having the same issue.

Edit 2: Solved!(?) Ok! It seems I found a solution, which may not be the best, but it's working properly! :) As far as I could see here http://docs.angularjs.org/api/ng.$timeout, we can use $timeout (a wrapper over setTimeout) with no delay! This is great because we aren't artificially delaying the execution of our code inside $timeout, but we're making the directive not to run it until the asynchronous request has finished.

Hope it will work for long-wait requests, too...

If someone knows a better way to fix it, please tell!

Gruntjs watch different folders and execute tasks

I was wondering if it's possible to configure a watch task to watch two different folders and execute a different task on each on folder. For example, whenever something changes is /folder1 then task1 should be executed, whenever something is changed in /folder2 then task2 should be executed.

The folder structure is of the following form: root |-folder1 |-folder2

AngularJS trigger and watch object value change in service from controller

I'm trying to watch for changes in a service from a controller. I tried various things based on many qns here on stackoverflow, but I've been unable to make it work.

html:

<div ng-app="myApp">
    <div ng-controller="MyCtrl">
        <div ng-click="setFTag()">Click Me</div>
    </div> 
</div>

javascript:

var myApp = angular.module('myApp',[]);

myApp.service('myService', function() {
    this.tags = {
        a: true,
        b: true
    };


    this.setFalseTag = function() {
        alert("Within myService->setFalseTag");
        this.tags.a = false;
        this.tags.b = false;

        //how do I get the watch in MyCtrl to be triggered?
    };
});


myApp.controller('MyCtrl', function($scope, myService) {

    $scope.setFTag = function() {
        alert("Within MyCtrl->setFTag");
        myService.setFalseTag();
    };        

    $scope.$watch(myService.tags, function(newVal, oldVal) {
        alert("Inside watch");
        console.log(newVal);
        console.log(oldVal);
    }, true);

});

How do I get the watch to trigger in the Controller?

jsfiddle