Renaming files in a jiffy

Want to rename a bunch of files in a directory? If you are using a *nix operating system, it can be done with a single command. A set of files I downloaded from a website had filenames of this pattern: sitename.com_someprefix_filename.txt. If at all I had been using a Windows box, that would have been a nightmare -- I could not do it without writing a Python program. Fortunately, I am using a Kubuntu Linux box; so I can rename all the files with a single command:

for i in *.txt
do
   mv $i "`echo $i | sed 's/TheWebSite.com_[^_][^_]*_//'`"
done 

If I put this in a shell script, I won't even have to type this long command again and again. Now I realise why Windows is not for power users (like me).