Question Regarding SVN
I am using tortoise SVN to check in, check out etc. The repository is present in a remote location.
How can I run svn commands in command line (windows xp) ?
Like others have said, TortoiseSVN does not come with the standard SVN client ( and here is the reason it doesn't - http://tortoisesvn.net/faq.html#svnbinaries)
So you need to install a SVN command line client for you to be running SVN commands. You can look at this link for those - http://subversion.apache.org/packages.html#windows.
It is great that you want to try out with command line as well, since eventhough GUI clients like Tortoise make your life much simpler, it is good to have the basic command line knowledge to understand what is happening and also for that situation where you cannot do something without the command line ( believe me, these situations do occur )
Using Command line SVN under Windows
It would be easier if you try to use using GUI options for better and faster work.
Tortoise does not install the command-line tools. You have to install it from the official site. Make sure to install compatible version, because the working directory format changes slightly over time. Generally the first two digits of version must match, so if your TortoiseSVN is linked against 1.6.x, you may install 1.6.y, but neither 1.5.z nor 1.7.z.