Is there any UNIX command to display a list of all package name installed in Ubuntu?
 

Is there any unix command to display list of all package name installed in ubuntu and windows ?

Please put separate questions in separate threads.

Only in linux..... Remember, linux is NOT windows. You can not access windows in that sort of sense.

But as far as within ubuntu, yes, with the following:
After you run that, you can view the outputted file with any text editor of your choice to view all installed applications and programs.

Cheers,

Josh

PS - Like Nylex said, please refrain from posting multiple subjects within one thread. If you have any more questions, please search the forums and the internet BEFORE you post, and if you still need assistance, then by all means, create a new thread.

As an educational addition to the above information on package management, commands using "dpkg" are not unix commands. They are not even Linux generic commands.

They are specific to Debian and Debian derived OS'. Put simply, "dpkg" is the heart of your package management.

There is an awful lot of information available about dpkg on your box and on the internet. A good place to start is;
Going to synaptic and running a search there for "dpkg" will get you some other interesting documentation.

A search on your favorite search engine will get you many pages of information.

Try it sometime. You will find it a fascinating study and you will be amazed at the power you can have. In such a study you will probably find references to "aptitude". Ubuntu, in their great wisdom, dropped this as a default install on their systems. You may find you want to install that too.