像用get f “文件名" 来获取文件的大小，它的返回值保存在哪呢？

以下是GET的帮助，看不懂

GET Version 2.8 - Bob Stephan's BATch Enhancer - Copyright 1999 Bob Stephan

GET Version 2.8 - Bob Stephan's BATch Enhancer - Copyright 1999 Bob Stephan
Syntax: GET command argument(s) /switches More Instructions: GET.DOC
Purpose Command Argument(s) Switches Environment ErrorLevel Extended
--------- ------- ----------- ----- --(GET=)--- --(Exit)-- -----
--------- String Handling and Screen I/O Commands --------
Echo EC "prompt" ANS -- -- --
Get character C All ASCII Char ASCII code No Echo
aNswer yes or no N All ASCII Char ASCII code No Echo
Get string S All String Length Echo .
Put string (Zap) Z AWX String Length --
Standard Input ZE AWX String Length --
In String # "string" WX Position in string Extract
Moving Text T "filespec" EX ASCII Char ASCII code No Echo
Key waiting I AEX --Character Waiting-- Get Char
Keyboard bUffer UW Locks Length Caps/Num
For UE:=test, =set:16=Scroll Lock, 32=Num Lock, 64=Caps Lock
'Rithmetic R num AW Result Result
Blank Screen B AWX --Old attribute-- HexAttr
Video mode/bordr V --Old mode/color-- Border
Video Cursor VC X --Old type/posit-- --
Date and Time H code ACSWX Value Value Strng/Ctry
Code:1=DoW 2=DoM 4=Mon 8=Yr 16=Hr 32=Min 64=Sec 128=odd/even 256=100ths 512=yy


--------- Disk and File Commands --------
File size F filespec AEWX Bytes/Hex KB/Wdiv Kb/10
File date F filespec /E/Wcode ACES Value Value Strng/Ctry
/E required, /W codes: 2, 4, 8, 16, 32, 64, 512 as for GET H
Full Path FP filespec Fullpath Length --
Disk free space K AWX Kilobytes KB/10/Wdiv Kb/100
Disk capacity Q AWX Kilobytes KB/10/Wdiv Kb/100
Volume label L AXH Label 1=yes,0=no Match
EXEC X "d:\path\program.ext" 'args' Exit Exit Path
Current dir Y Directory Level:Root=0
Current drive YE (boot drive /X) Drive Drive:A=0
--------- Memory and System Commands --------
Environment left E (full size /X) Bytes Bytes Bytes/10
Memory free/Ext M (full size /X) EWdiv Kilobytes KB/MB/Wdiv Exit/10
Break Flag BR Old flag --
Printer(PRN) P X 1=yes,0=no 1=yes,0=no Init
DOS Version D Major Vers MajorMinor MinorEnv
DESQview Version DV Major Vers MajorMinor --
4DOS Version 4 Major Vers MajorMinor --
Windows 4E 1=yes,0=no 1=yes,0=no --
Coprocessor/CPU 7 1=yes,0=no 1=yes,0=no CPU Type
ANSI.SYS/Model A 1=yes,0=no 1=yes,0=no PC Model
Warm/Cold Boot W If arg:1=warm, 0=cold ColdBoot


Surrogates: }=Carriage Return, ~=Escape, Alt-255=Space/Blank.
GLOBAL SWITCHES: (apply to most commands if appropriate)
/H Hex output, /M Master Env, /R Return Code in Environment, /U /L case
/B flush key Buffer, /TL/TR/T Trim Left/Right/Both, /Vvar=, /V- No var
WINDOWS NT solutions: (see GET28NEW.DOC) /O for redirected output with >>
/V@filespec append the environment variable to the specified file
LOCAL SWITCHES: (action depends on the command)
/A Attribute , All bytes , ASCII /N No CR
/K 10 second timeout Kountdown, /S Sound control/Date format
/C suppress Ctrl-Break during input , Compressed date
/E /X EXtended keys or EXtra feature, /W Wait or numerical value
See GET.DOC for additional features and BATch programming instructions.
See GET28NEW.DOC for new and changed features in Version 2.8.
GET is a shareware product. Registration is required for continued use.

请问搂住在那里下载的这个get.exe?我不知道在哪里能得到？
如告诉，不胜感激。

可以用 for %%~z?

下面是作者的原始链接：
http://www.redshift.com/~bstephan/bs01000.htm

里面有完整的使用文档，当然，是英文的，不过并不复杂。