Linux shorthand for rename/move/copy

As a Linux user you frequently use the terminal as it is powerful as [insert sentence enhancer].
A frequent thing you do in a terminal is copy or move/rename a file. When you do frequent things you'll get frequent annoyances (should sound familiar).

Example:
When you want to copy a file from "some/subdir/of/the/current/working/dir/file.ext" to "some/subdir/of/the/current/working/dir/file.ext.bak" you have to type the entire path twice. Even with tab completion it gets annoying.

Solution:
Use them fancy curly bracket things!
Instead of this:

 cp some/subdir/of/the/current/working/dir/file.ext some/subdir/of/the/current/working/dir/file.ext.bak  

Do this:

 cp some/subdir/of/the/current/working/dir/file.ext{,.bak}  

The curly brackets are interpreted to multiply the string it is in and make all combinations. So the latter is transformed to the first.
You can also embed them:

 echo a{,b{,c}}  

That's translated to:

 echo a ab abc