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In computing, ren (or rename) is a command in various DOS, OS/2 and Microsoft Windows command line interpreters (shells) such as COMMAND.COM, cmd.exe, 4DOS, 4NT and Windows PowerShell. It is used to rename files and in some implementations also directories. It can also move a file to a new path, if it is on the same device. It is analogous to the Unix mv command. RT-11, RSX-11 and OpenVMS also provide the rename command which can be contracted to ren.
In Windows PowerShell, ren is a predefined command alias for the Rename-Item Cmdlet which basically serves the same purpose.
Example
Another example. This will rename a default video found in Windows 7 with a new name:
References
Ren (command) Wikipedia(Text) CC BY-SA