File Renaming

In my site I have many files and I need a command to rename it automatically, it goes like this

The files I have now are names..

k201.jpg
k202.jpg
k203.jpg
k204.jpg

I need to rename it...
201t.jpg
202t.jpg
203t.jpg
204t.jpg

Removing the k from the begining and adding a t at the last of every file name.

My server is a Linux, how can I do it from command prompt or by a PHP script?

 

 

 

 

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