Eliminating duplicate photos

[Timothy Murphy]

What is the best way of eliminating duplicate photos
on a number of machines, all running Fedora or CentOS?

I suppose one could ask the same question about files generally;
how to tag or delete duplicates.

Any suggestions gratefully received.

-- 
Timothy Murphy  
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland