How do I open the directory of the current open file?
Try :Ex[plore]
. From :help Ex
:
:Explore will open the local-directory browser on the current file's directory (or on directory [dir] if specified). The window will be split only if the file has been modified, otherwise the browsing window will take over that window. Normally the splitting is taken horizontally.
I personally prefer the:
:Sex
command. It does the split window for you, and drops you into the current directory.
:Sex dir/to/my
works too.
You could use:
:e %:h
More info on expansions is here: http://vimdoc.sourceforge.net/htmldoc/eval.html#expand()