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It kind of depends on what you consider an unwanted file. Also, which distribution are you using, because different distributions tend to keep some files in different locations.
Learn to use your distribution's package manager (if it has one, which most do), as they all offer ways to "purge" packages - removing a package usually leaves a breadcrumb trail telling you that a particular program has, at some point, existed on your hard drive, whereas purging a package usually eliminates any trace that a program ever existed (it will remove things like .conf files and any directories in any users' home directories that were created by the program).
I dare say that there are "unwanted files" on every computer. But--"unwanted" by whom?
Before deleting something, you would have to a) know what it does, and b) know whether you needed it (this means you would have to know if another program uses the file). I'll bet you can find MANY files that noone here can identify.
you would be far better off building something like Linux form Scratch, and only installing what you DO need.
Firstly Beagle, especially if you have it indexing all the web pages you visit. If you can remember where you put things in your own filing system, you may not want Beagle at all.
Secondly, do you have thumbnails displayed alongside every entry in your file browser? If so, take a look in ~/.thumbnails -- I've currently got 2100 there.
If you are interested in managing the number of services running, which will actually speed up the computer, take a look at www.mjmwired.net/resources/mjm-services-f8.html. Although it's aimed at Fedora, it's a good guide if you don't know your ahavi from your nmbd.
Thanking u all for the reply
Iam using redhat 5
My question since iam new to linux , .iam comparing linux with windows .As in windows we have temp dir under that there are unwanted files that we can delete,that wont harm to our system .As in linux also i have seen one temp dir under that there are many files are they also unwanted files.