in the command-line gives help about this syntax (which can be used outside FOR, too, this is just the place where help can be found).
In addition, substitution of FOR
variable references has been enhanced.
You can now use the following optional
%~I - expands %I removing any surrounding quotes (") %~fI - expands %I to a fully qualified path name %~dI - expands %I to a drive letter only %~pI - expands %I to a path only %~nI - expands %I to a file name only %~xI - expands %I to a file extension only %~sI - expanded path contains short names only %~aI - expands %I to file attributes of file %~tI - expands %I to date/time of file %~zI - expands %I to size of file %~$PATH:I - searches the directories listed in the PATH environment variable and expands %I to the fully qualified name of the first one found. If the environment variable name is not defined or the file is not found by the search, then this modifier expands to the empty string
The modifiers can be combined to get
%~dpI - expands %I to a drive letter and path only %~nxI - expands %I to a file name and extension only %~fsI - expands %I to a full path name with short names only %~dp$PATH:I - searches the directories listed in the PATH environment variable for %I and expands to the drive letter and path of the first one found. %~ftzaI - expands %I to a DIR like output line
In the above examples %I and PATH can
be replaced by other valid values.
The %~ syntax is terminated by a valid
FOR variable name. Picking upper case
variable names like %I makes it more
readable and avoids confusion with the
modifiers, which are not case
There are different letters you can use like
f for “full path name”,
d for drive letter,
p for path, and they can be combined.
%~ is the beginning for each of those sequences and a number
I denotes it works on the parameter
%0 is the complete name of the batch file, just like you assumed).