FieldSize is an option for InputField, PopupMenu, and related functions that specifies the size of the field allowed for input or contents.
FileBaseName["file"] gives the base name for a file without its extension.
FileDate["file"] gives the date and time at which a file was last modified. FileDate["file", " type"] gives information on the specified type of date associated with a file.
FileExtension["file"] gives the file extension for a file name.
FileFormat["name"] attempts to determine what Import format could be used to import the file corresponding to " name".
FileNameDepth["file"] gives the number of path elements in the file name " file".
FileNameDrop["name", n] drops the first n path elements in the file name " name".FileNameDrop["name", -n] drops the last n path elements in the file name " ...
FileNameSplit["filename"] splits a file name into a list of parts.
FindCurvePath[{{x_1, y_1}, {x_2, y_2}, ...}] gives an ordering of the {x_i, y_i} that corresponds to one or more smooth curves.
FindHamiltonianCycle[g] finds a Hamiltonian cycle in the graph g if one exists.