How do I move the oldest or newest file in a directory to another with Mac OS X Terminal

Question

I\'m trying to us the following command on Mac OSX 10.6 Terminal but it does not work..Any idea what I may be doing wrong?

These work...

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Answer 1

You're moving the newest file. Try

mv `ls -t |tail -1` newdirname

or

mv `ls -tr |head -1` newdirname

Working on my Ubuntu's bash.