How will I rename every file in a directory to their filenames appending anything?

[Mark Jayson Alvarez]

Example.
I would want to rename every file that ends in .mp3 to
their filename with appended .old.

so that, test.mp3 will be renamed test.mp3.old?
my initial command would then be:

ls |grep mp3 |xargs -J # mv #..[this part is what
trying to figure out]

How will I tell the mv that its arguments would be the
output of ls and append something like ".old" to it?
~


Thanks!



	
		
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