Question on Dependencies

[Bob Katz]

Hi Derick
                           Thank You for the information  I have been  
reading your post's on the newbie mail list and have found  them to  
be useful in trying to understand how the linux os works   in fact I  
have put some of those post's in a folder for future reference  I  
will try the $man yum command and see what t information that brings
                                                                         
                                   Thank You
																		Bob


On Jun 13, 2006, at 3:38 PM, Derick Centeno wrote:

> Hi Bob:
> A quick answer would be to refer you to the linux system itself.   
> You could do:
>
> $man yum
>
> or likewise
>
> $man rpm
>
> and you would get rather basic information which could be useful.   
> The key here is that rpm is an almost standard way of maintaining  
> one package containing one application.
> Dependencies really are independent programs which provide a  
> function or other capability to a larger program which that larger  
> program originally didn't have.  It is sometimes the case the  
> different applications can share or use the same dependencies.   
> Like the larger application program, dependencies have their own  
> programmers and designers which support just that.
>
> If you took the time to read the description of yum or rpm provided  
> in the man pages, you would see that yum itself utilizes rpm.  In a  
> narrow sense, rpm is a dependency for yum itself.
>
> What rpm does for one package or application or dependency -- yum  
> can do for several dependencies and applications at one time -- at  
> the same time.  yum receives instructions regarding where  
> applications are from yum.conf and when yum.conf is correctly  
> structured it allows yum to search find and install programs or  
> dependencies where-ever they are found to exist first.  It is quite  
> possible for one location to have an application, but not the  
> dependency and another to have the dependency but not the  
> application; yum sorts that information all out and collects  
> whatever is needed arranging it in the correct order required by  
> that application using a certain dependency (as some applications  
> are so sensitive that they won't work unless the see the correct  
> dependency at an exact order to be used for future processing at a  
> precise point during the build process of that application) -- this  
> is what yum figures out for you.  The speed it does this all at is  
> affected by whether you use broadband or not.
>
> However, given the complexity and how huge many programs are today,  
> you can intuit that you would be using just rpm all day -- that is  
> if you found all the correct dependencies and could place them in  
> the correct sequence as you build an application into an  
> executeable from it's source.  Yum on the other hand, shortens all  
> that for you allowing you to have a chance of living a reasonable  
> humane life.
>
> Again yum tracks down for you all related dependencies an  
> application needs, together with the application itself and  
> installs them all together; when yum is finished you can run the  
> application right then -- sometimes not even a reboot is  
> necessary.   rpm cannot do all that, it is not required or expected  
> to; however without rpm Linux would not have a common agreed upon  
> means of package containment.
>
> Best of Luck...
>
> On Jun 13, 2006, at 4:34 AM, Bob Katz wrote:
>
>> Hi
>>          I have been trying to install packages with no luck the  
>> biggest problem is when I try to run the rpm it states that I need  
>> a package (dependencies) But when I run yum list installed it  
>> states that I have that package installed on my disk
>>
>>          This problem has happened 3-4 times already  why does the  
>> rpm not see the package installed I don't get this
>>
>>                                                                       
>>                                                                       
>>     Thank You
>>                                                                       
>>                                                                       
>>                                                                    
>> Bob_______________________________________________
>
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