Unix "rename" Terminal command available in OS X?

Question

Hello,
I have a couple of different cameras/phones that deliver their photos as
DSC00001.jpg
DSC00002.jpg
DSC00003.jpg
etc.
I want to be able to rename these files such that "DSC" is replaced by the camera or phone that took the shot. The "rename" command in Unix (and CMD prompt in XP) do exactly what I need. I just run
rename DSC*.jpg W580i*.jpg and all of file in the folder are renamed.
When I try and run the rename command in a Terminal in OS X, I get this error
mr-mbp:Pix_Xfer MR$ rename
-bash: rename: command not found
Is there a way to enable the rename command in OS X?
I found a nice script called "Replace Text in Item Names" that does what is needed however the command seems so much easier...
THx!
/MR

Answer 1

If I were renaming a single file mv would be perfect, but I need to do many files at once. The practicum is that I have a set of files that have an underscore in the file name. I wrote a perl script that automatically generates LaTeX code to make a book for the pictures. However, the \includegraphics command in LaTeX does not care for underscores in filenames so I want to transliterate the underscores into something more LaTeX friendly, like dashes. With rename it's as simple as this:
rename _ - *.jpg
and all of my images that had underscores in their names are replaced with dashes. mv just isn't practical when I'm looking at hundreds (or more) of images. That's why I was so interested in the build of rename from linux -- I don't care what the source is, I just need the functionality.
Now, the rename.c file does have a shell script at the top that is a very decent substitute:
#!/bin/sh
if [ $# -le 2 ]; then
echo call: rename from to files; exit;
fi
FROM="$1"
TO="$2"
shift
shift
for i in $@; do N=`echo "$i" | sed "s/$FROM/$TO/g"`; mv "$i" "$N"; done
but the compiled C program does fix some potential issues, and it would also satisfy the purist in me that loves having a native compiled rendition of rename around.