Sounds great but can it be made totally transparent and bullet-proof so it can be used on mobile phone screens?

A NeXT consultant showed me this:

    mv /some/long/path/{old,new}file.blah

The {,} notation expands the containing word to a space-separated list obtained by substituting in each thing in the {}, giving for the above:

    mv /some/long/path/oldfile.blah /some/long/path/newfile.blah

Great for mv, cp, ln, diff, cmp.