Uploaded October 2012 | Updated September 2026, 2 weeks ago
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By suphalb@techytube, for more from this author visit:
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Now a days YUM is most important utility on any Linux box what supports RPM(RedHat Package Manager). In this video i would demonstrate how to setup Local and Remote Yum Repository on your Linux Box. Please note YUM is applicable only on Linux Machine what supports RPM likewise Redhat, CentOS, Fedora etc. Also you should able to install, remove , update, modify any packages on your linux box after watching these videos step by step. All of these videos are combined into 4 parts. In these all 4 parts of videos i tried to demonstrate the usage of YUM in different aspect. Overall you can learn how to manage and maintain packages on your linux system using YUM. Watch all of these 4 parts to gain maximum benefit from it.
Thanks
TechyTube Team
Subscribe to our channel here for notifications on new video trainings. For more videos on technology, visit our website at http://www.techytube.com.
By suphalb@techytube, for more from this author visit:
techytube.com/author/suphalb
Now a days YUM is most important utility on any Linux box what supports RPM(RedHat Package Manager). In this video i would demonstrate how to setup Local and Remote Yum Repository on your Linux Box. Please note YUM is applicable only on Linux Machine what supports RPM likewise Redhat, CentOS, Fedora etc. Also you should able to install, remove , update, modify any packages on your linux box after watching these videos step by step. All of these videos are combined into 4 parts. In these all 4 parts of videos i tried to demonstrate the usage of YUM in different aspect. Overall you can learn how to manage and maintain packages on your linux system using YUM. Watch all of these 4 parts to gain maximum benefit from it.
Thanks
TechyTube Team

![Archiving and unarchiving objects in Objective-C
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By pavel@techytube, for more from this author visit:
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There are situations when we want to save the state of our objects to the system, for example when our app has to go in the background, or to terminate.
Of course, we can do our way for saving our objects, but iOS SDK provides us an elegant way for doing that by using NSKeyedArchiver - to archive objects, and NSKeyedUnarchiver - to unarchive objects.
But in order for those methods to work correctly, we need to implement 2 instance methods in the class we want to be able to archive, or unarchive.
These methods are mandatary in such situations, and should look like this:
- (void)encodeWithCoder:(NSCoder *)coder
{
[coder encodeObject:somePropertyOrField forKey:@KeyName];
}
- (id)initWithCoder:(NSCoder *)coder
{
self.propertyName = [coder decodeObjectForKey:@KeyName1];
fieldName = [coder decodeObjectForKey:@KeyName2];
return self;
}
somePropertyOrField must be a property or a field of our class; @KeyName, @KeyName1 ..., @KeyNamen may be arbitrary names we choose.
To archive (save the object on the File System), we use:
[NSKeyedArchiver archiveRootObject:objectName toFile:@/Users/pavel/myObjectState.plist];
which create the .plist file (which a special XML-format file in iOS) at the indicated path.
To unarchive (restore an object state from a file), we use:
MyClass *newObjectName = [NSKeyedUnarchiver unarchiveObjectWithFile:@/Users/pavel/myObjectState.plist];
which initializes the new object with the corresponding values from the .plist file. Archiving and unarchiving objects in Objective-C](https://i.ytimg.com/vi/KSIU8zRi7zk/mqdefault.jpg)








