how to revert commit in git

If we want to rollback to our previous commit, then we just use the below command:

git revert head

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rails auth devise cookie prob

We can modify the devise generated cookie attributes in rails application in the following code block:

Application.config.session_store :cookie_store, {
  :key =>           '_session_id',
  :path =>          '/',
  :domain =>        nil,
  :expire_after =>  nil,
  :secure =>        false,
  :httponly =>      true,
  :cookie_only =>   true
}

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get all attributes of an element

If we want to see all the attributes of an HTML elements, we can run the following javascript code block.

var el =this;
    var attrib="";
        for(var i = 0; i < el.attributes.length; i++) {
            attrib = attrib + ' ' + el.attributes.item(i).nodeName + ' = "' + el.attributes.item(i).nodeValue + '"';
        }

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How to hide a menu or module from Logged in users in Joomla

Joomla 1.6 brings the capability for that. Ok, here is how to get this done,
• 1. Create a new group in Users > Groups. Name it GUESTS. Select Parent Group as PUBLIC.
• 2. Goto Users > Options > Component tab. Select GUEST as the "Guest User Group" there.
• 3. Create a new ACL in Users > Acces Levels . Name it as GUEST USERS.
• 4. Edit GUESTS USERS ACL, which you just created and select GUESTS group to it. Dont add PUBLIC group to it.
• 5. Edit PUBLIC ACL and add GUEST USERS ACL to it.
• 6. Now you are done with the group and access level creation. Now goto Global Configuration and select DEFAULT ACCESS LEVEL as GUEST USERS.
• 7. Now, you are ready to go. Make any menu item or module to test. Just select , Access as GUEST USER in that item and test on frontend. You can see that menu item/module when you are not logged in. And as soon as you login, that menu item/module will be hidden.

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Passing JavaScript Array To PHP Through JQuery $.ajax

If you want to pass a javascript array to php, you can do that in the following manner. First, set your javascript array into a variable.

data: { activitiesArray : activities },

That's it! now you can access it in PHP. Just use the following way:

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The action you have requested is not allowed.

In code igniter, we set the csrf protection to true for form submission. For some reason, if we don't have the token passed from a submitted form, then we get the below error:

The action you have requested is not allowed.

To solve this problem, we need to turn off the csrf protection in code igniter.

$config['csrf_protection'] = FALSE; 

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delete all .svn file from subfolders in linux

If we want to remove a specific folder from all the subfolders, then run the below command:

find . -name ".svn" -exec rm -rf {} \;

Sometimes, we need to remove all the .svn file from the subfolders, then this command is helpful.
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Terminate user session accessed to a postgresql db

When you try to remove a postgresql database, you may find that your database is accessed by some other user. Then run the below sql command in the postgresql database. It will remove the accessed user sessions.

select pg_terminate_backend(procpid) from pg_stat_activity where datname = 'openbravo';

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ping: unknown host

In the resolv.conf file, we have the ip address of our name servers. If for some reason, we may have missed the name server value in the resolv.conf file. Then we will have the above error message. To solve this problem, you need to go through the below steps:
Go to the below file:

/etc/resolv.conf

And write the following, this is a sample file, you need to write your server name and the name server ip addresses.

search cyberciti.biz
nameserver 202.54.1.10
nameserver 202.54.1.11

For example, for Rackspace, we have the below name server ip addresses :

nameserver 173.203.4.8
nameserver 173.203.4.9

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sudo: add-apt-repository: command not found

If you want to add java repository or any repository using the add-apt-repository command, then you may find the above error message. To solve this error, run the following command on the terminal:

sudo apt-get install python-software-properties

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E: Package 'sun-java6-jdk' has no installation candidate

I have come across this error while installing java on ubuntu 11.04 (Natty). Later, I found that the java repository is not added to ubuntu. So, I have added the java repository to my ubuntu server.

sudo add-apt-repository ppa:ferramroberto/java

sudo apt-get update

sudo apt-get install sun-java6-jdk sun-java6-plugin

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