Relative path to source when copying or moving [duplicate]

_{This might be trivial, but here goes.}

In terminal, I tend to find myself moving/renaming/copying files that are not in my current working directory instead of cd-ing to the directory of those files first. For example, I find myself doing:

mv long/path/to/a/folder long/path/to/a/folder.old

Sometimes, this can be a "long/path with spaces/to/a/folder".

My question is: is there a way/shortcut for the <target path> to be relative to the <source path>? For instance, does something like this exist:

mv long/path/to/a/folder ``/folder.old

Where `` means "the same path or the same parent path of the file/folder I'm trying to move", so in my example `` would stand for long/path/to/a/.

I know I could of course cd long/path/to/a/ and then mv folder folder.old, but that involves an extra command, and I'll end up in another working directory.

This should do the trick:

mv long/path/to/a/folder{,.old}

Reference: search for Brace Expansion in bash manpage.