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²Î ÊýÔÚÅú´¦ÀíÖÐÒ²×÷Ϊ±äÁ¿´¦Àí, ËùÒÔͬÑùʹÓðٷֺÅ×÷ΪÒýµ¼·û, Æäºó¸ú0-9ÖеÄÒ»¸öÊý×Ö¹¹³É²ÎÊýÒýÓ÷û. ÒýÓ÷ûºÍ²ÎÊýÖ®¼ä (ÀýÈçÉÏÎÄÖÐµÄ %1     Óë a: ) µÄ¹ØϵÀàËÆÓÚ±äÁ¿Ö¸ÕëÓë±äÁ¿ÖµµÄ¹Øϵ. µ±ÎÒÃÇÒªÒýÓõÚʮһ¸ö»ò¸ü¶à¸ö²ÎÊýʱ, ¾Í±ØÐëÒƶ¯DOS µÄ²ÎÊýÆðʼָÕë. shift ÃüÁîÕý ³äµ±ÁËÕâ¸öÒƶ¯Ö¸ÕëµÄ½ÇÉ«, Ëü½«²ÎÊýµÄÆðʼָÕëÒƶ¯µ½ÏÂÒ»¸ö²ÎÊý, ÀàËÆC ÓïÑÔÖеÄÖ¸Õë²Ù×÷. ͼʾÈçÏÂ:

³õʼ״̬, cmd ΪÃüÁîÃû, ¿ÉÒÔÓà %0 ÒýÓÃ
cmd arg1 arg2 arg3 arg4 arg5 arg6 arg7 arg8 arg9 arg10
^ ^ ^ ^ ^ ^ ^ ^ ^ ^
| | | | | | | | | |
%0 %1 %2 %3 %4 %5 %6 %7 %8 %9

¾­¹ý1´Îshiftºó, cmd ½«ÎÞ·¨±»ÒýÓÃ
cmd arg1 arg2 arg3 arg4 arg5 arg6 arg7 arg8 arg9 arg10
^ ^ ^ ^ ^ ^ ^ ^ ^ ^
| | | | | | | | | |
%0 %1 %2 %3 %4 %5 %6 %7 %8 %9

¾­¹ý2´Îshiftºó, arg1Ò²±»·ÏÆú, %9Ö¸ÏòΪ¿Õ, ûÓÐÒýÓÃÒâÒå
cmd arg1 arg2 arg3 arg4 arg5 arg6 arg7 arg8 arg9 arg10
^ ^ ^ ^ ^ ^ ^ ^ ^
| | | | | | | | |
%0 %1 %2 %3 %4 %5 %6 %7 %8

Òź¶µÄÊÇ, win9x ºÍDOSϾù²»Ö§³Ö shift µÄÄæ²Ù×÷. Ö»ÓÐÔÚ nt ÄÚºËÃüÁîÐл·¾³ÏÂ, shift ²ÅÖ§³Ö /n ²ÎÊý, ¿ÉÒÔÒÔµÚÒ»²ÎÊýΪ»ù×¼·µ¸´Òƶ¯ÆðʼָÕë.
=================

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if goto choice forÊÇÅú´¦ÀíÎļþÖбȽϸ߼¶µÄÃüÁÈç¹ûÕ⼸¸öÄãÓõúÜÊìÁ·£¬Äã¾ÍÊÇÅú´¦ÀíÎļþµÄר¼ÒÀ²¡£


Ò»¡¢if ÊÇÌõ¼þÓï¾ä£¬ÓÃÀ´ÅжÏÊÇ·ñ·ûºÏ¹æ¶¨µÄÌõ¼þ£¬´Ó¶ø¾ö¶¨Ö´Ðв»Í¬µÄÃüÁî¡£ ÓÐÈýÖÖ¸ñʽ:

1¡¢if [not] "²ÎÊý" == "×Ö·û´®" ´ýÖ´ÐеÄÃüÁî

²ÎÊýÈç¹ûµÈÓÚ(not±íʾ²»µÈ£¬ÏÂͬ)Ö¸¶¨µÄ×Ö·û´®£¬ÔòÌõ¼þ³ÉÁ¢£¬ÔËÐÐÃüÁ·ñÔòÔËÐÐÏÂÒ»¾ä¡£

Àý£ºif "%1"=="a" format a:

====

if µÄÃüÁîÐаïÖúÖйØÓڴ˵ãµÄÃèÊöΪ:
IF [NOT] string1==string2 command
ÔÚ´ËÓÐÒÔϼ¸µãÐèҪעÒâ:
1. °üº¬×Ö·û´®µÄË«ÒýºÅ²»ÊÇÓï·¨Ëù±ØÐëµÄ, ¶øÖ»ÊÇÏ°¹ßÉÏʹÓõÄÒ»ÖÖ"·À¿Õ"×Ö·û
2. string1 δ±ØÊDzÎÊý, ËüÒ²¿ÉÒÔÊÇ»·¾³±äÁ¿, Ñ­»·±äÁ¿ÒÔ¼°ÆäËû×Ö·û´®³£Á¿»ò±äÁ¿
3. command ²»ÊÇÓï·¨Ëù±ØÐëµÄ, string2 ºó¸úÒ»¸ö¿Õ¸ñ¾Í¿ÉÒÔ¹¹³ÉÒ»¸öÓÐЧµÄÃüÁîÐÐ
=============================

2¡¢if [not] exist [·¾¶\]ÎļþÃû ´ýÖ´ÐеÄÃüÁî
Èç¹ûÓÐÖ¸¶¨µÄÎļþ£¬ÔòÌõ¼þ³ÉÁ¢£¬ÔËÐÐÃüÁ·ñÔòÔËÐÐÏÂÒ»¾ä¡£

Èç: if exist c:\config.sys type c:\config.sys
±íʾÈç¹û´æÔÚc:\config.sysÎļþ£¬ÔòÏÔʾËüµÄÄÚÈÝ¡£

****** ×¢ ********
Ò²¿ÉÒÔʹÓÃÒÔϵÄÓ÷¨:
if exist command
device ÊÇÖ¸DOSϵͳÖÐÒѼÓÔصÄÉ豸, ÔÚwin98ÏÂͨ³£ÓÐ:
AUX, PRN, CON, NUL
COM1, COM2, COM3, COM4
LPT1, LPT2, LPT3, LPT4
XMSXXXX0, EMMXXXX0
A: B: C: ...,
CLOCK$, CONFIG$, DblBuff$, IFS$HLP$
¾ßÌåµÄÄÚÈÝ»áÒòÓ²Èí¼þ»·¾³µÄ²»Í¬¶øÂÔÓвîÒì, ʹÓÃÕâЩÉ豸Ãû³Æʱ, ÐèÒª±£Ö¤ÒÔÏÂÈýµã:
1. ¸ÃÉ豸ȷʵ´æÔÚ(ÓÉÈí¼þÐéÄâµÄÉ豸³ýÍâ)
2. ¸ÃÉ豸Çý¶¯³ÌÐòÒѼÓÔØ(aux, prnµÈ±ê×¼É豸ÓÉϵͳȱʡ¶¨Òå)
3. ¸ÃÉ豸ÒÑ×¼±¸ºÃ(Ö÷ÒªÊÇÖ¸a: b: ..., com1..., lpt1...µÈ)
¿Éͨ¹ýÃüÁî mem/d | find "device" /i À´¼ìÔÄÄãµÄϵͳÖÐËù¼ÓÔصÄÉ豸
Áí Íâ, ÔÚDOSϵͳÖÐ, É豸Ҳ±»ÈÏΪÊÇÒ»ÖÖÌØÊâµÄÎļþ, ¶øÎļþÒ²¿ÉÒÔ³Æ×÷×Ö·ûÉ豸; ÒòΪÉ豸(device)ÓëÎļþ¶¼ÊÇʹÓþä±ú(handle)À´ ¹ÜÀíµÄ, ¾ä±ú¾ÍÊÇÃû×Ö, ÀàËÆÓÚÎļþÃû, Ö»²»¹ý¾ä±ú²»ÊÇÓ¦ÓÃÓÚ´ÅÅ̹ÜÀí, ¶øÊÇÓ¦ÓÃÓÚÄÚ´æ¹ÜÀí¶øÒÑ, ËùνÉ豸¼ÓÔØÒ²¼´Ö¸ÔÚÄÚ´æÖÐΪÆä·ÖÅä¿ÉÒýÓÃµÄ¾ä ±ú.
==================================

3¡¢if errorlevel <Êý×Ö> ´ýÖ´ÐеÄÃüÁî

ºÜ ¶àDOS³ÌÐòÔÚÔËÐнáÊøºó»á·µ»ØÒ»¸öÊý×ÖÖµÓÃÀ´±íʾ³ÌÐòÔËÐеĽá¹û(»òÕß״̬)£¬Í¨¹ýif errorlevelÃüÁî¿ÉÒÔÅжϳÌÐòµÄ·µ»ØÖµ£¬¸ù¾Ý²»Í¬µÄ·µ »ØÖµÀ´¾ö¶¨Ö´Ðв»Í¬µÄÃüÁî(·µ»ØÖµ±ØÐë°´ÕÕ´Ó´óµ½Ð¡µÄ˳ÐòÅÅÁÐ)¡£Èç¹û·µ»ØÖµµÈÓÚÖ¸¶¨µÄÊý×Ö£¬ÔòÌõ¼þ³ÉÁ¢£¬ÔËÐÐÃüÁ·ñÔòÔËÐÐÏÂÒ»¾ä¡£

Èçif errorlevel 2 goto x2

==== ×¢ ===========
·µ»ØÖµ´Ó´óµ½Ð¡µÄ˳ÐòÅÅÁв»ÊDZØÐëµÄ, ¶øÖ»ÊÇÖ´ÐÐÃüÁîΪ goto ʱµÄÏ°¹ßÓ÷¨, µ±Ê¹Óà set ×÷ΪִÐÐÃüÁîʱ, ͨ³£»á´ÓСµ½´ó˳ÐòÅÅÁÐ, ±ÈÈçÐ轫·µ»ØÂëÖÃÈë»·¾³±äÁ¿, ¾ÍÐèʹÓÃÒÔϵÄ˳ÐòÐÎʽ:

if errorlevel 1 set el=1
if errorlevel 2 set el=2
if errorlevel 3 set el=3
if errorlevel 4 set el=4
if errorlevel 5 set el=5
...

µ±È», Ò²¿ÉÒÔʹÓÃÒÔÏÂÑ­»·À´Ìæ´ú, Ô­ÀíÊÇÒ»ÖµÄ:
for %%e in (1 2 3 4 5 6 7 8...) do if errorlevel %%e set el=%%e

¸ü¸ßЧ¼ò½àµÄÓ÷¨, ¿ÉÒԲο¼ÎÒдµÄÁíһƪ¹ØÓÚ»ñÈ¡ errorlevel µÄÎÄÕÂ

³ö ÏÖ´ËÖÖÏÖÏóµÄÔ­ÒòÊÇ, if errorlevel ±È½Ï·µ»ØÂëµÄÅжÏÌõ¼þ²¢·ÇµÈÓÚ, ¶øÊÇ´óÓÚµÈÓÚ. ÓÉÓÚ goto µÄÌøתÌØÐÔ, ÓÉСµ½´óÅÅÐò»áµ¼ ÖÂÔÚ½ÏСµÄ·µ»ØÂë´¦¾ÍÌø³ö; ¶øÓÉÓÚ setÃüÁîµÄ "Öظ´" ¸³ÖµÌØÐÔ, ÓÉ´óµ½Ð¡ÅÅÐò»áµ¼Ö½ÏСµÄ·µ»ØÂë "¸²¸Ç" ½Ï´óµÄ·µ»ØÂë.

ÁíÍâ, ËäÈ» if errorlevel=<Êý×Ö> command Ò²ÊÇÓÐЧµÄÃüÁîÐÐ, µ«Ò²Ö»ÊÇ command.com ½âÊÍÃüÁîÐÐʱ½« = ×÷ΪÃüÁîÐÐÇзַû¶øºöÂÔµô°ÕÁË
===========================
¶þ¡¢goto Åú´¦ÀíÎļþÔËÐе½ÕâÀｫÌøµ½gotoËùÖ¸¶¨µÄ±êºÅ(±êºÅ¼´label£¬±êºÅÓÃ:ºó¸ú±ê×¼×Ö·û´®À´¶¨Òå)´¦£¬gotoÓï¾äÒ»°ãÓëifÅäºÏʹÓ㬸ù¾Ý²»Í¬µÄÌõ¼þÀ´Ö´Ðв»Í¬µÄÃüÁî×é¡£

Èç:

goto end

:end
echo this is the end

±êºÅÓÃ":×Ö·û´®"À´¶¨Ò壬±êºÅËùÔÚÐв»±»Ö´ÐС£

====     ±à×¢

label ³£±»ÒëΪ "±êÇ©" , µ«ÊÇÕâ²¢²»¾ßÓй㷺µÄÔ¼¶¨ÐÔ.

goto     Óë : ÁªÓÿÉʵÏÖÖ´ÐÐÖÐ;µÄÌøת, ÔÙ½áºÏ if ¿ÉʵÏÖÖ´Ðйý³ÌµÄÌõ¼þ·ÖÖ§, ¶à¸ö if ¼´¿ÉʵÏÖÃüÁîµÄ·Ö×é, ÀàËÆ C ÖР    switch case ½á¹¹»òÕß Basic ÖÐµÄ select case ½á¹¹, ´ó¹æÄ£Çҽṹ»¯µÄÃüÁî·Ö×é¼´¿ÉʵÏָ߼¶ÓïÑÔÖеĺ¯Êý¹¦ÄÜ. ÒÔ ÏÂÊÇÅú´¦ÀíºÍC/BasicÔÚÓï·¨½á¹¹ÉϵĶÔÕÕ:

Batch C / Basic
goto&: goto&:
goto&:&if if{}&else{} / if&elseif&endif
goto&:&if... switch&case / select case
goto&:&if&set&envar... function() / function(),sub()
==================================
Èý¡¢choice ʹÓôËÃüÁî¿ÉÒÔÈÃÓû§ÊäÈëÒ»¸ö×Ö·û£¨ÓÃÓÚÑ¡Ôñ£©£¬´Ó¶ø¸ù¾ÝÓû§µÄÑ¡Ôñ·µ»Ø²»Í¬µÄerrorlevel£¬È»ºóÓÚif errorlevelÅäºÏ£¬¸ù¾ÝÓû§µÄÑ¡ÔñÔËÐв»Í¬µÄÃüÁî¡£

×¢Ò⣺choiceÃüÁîΪDOS»òÕßWindowsϵͳÌṩµÄÍⲿÃüÁ²»Í¬°æ±¾µÄchoiceÃüÁîÓï·¨»áÉÔÓв»Í¬£¬ÇëÓÃchoice /?²é¿´Ó÷¨¡£

choiceµÄÃüÁîÓï·¨£¨¸ÃÓ﷨ΪWindows 2003ÖÐchoiceÃüÁîµÄÓï·¨£¬ÆäËü°æ±¾µÄchoiceµÄÃüÁîÓï·¨Óë´Ë´óͬСÒ죩£º

CHOICE [/C choices] [/N] [/CS] [/T timeout /D choice] [/M text]

ÃèÊö:
¸Ã¹¤¾ßÔÊÐíÓû§´ÓÑ¡ÔñÁбíÑ¡ÔñÒ»¸öÏîÄ¿²¢·µ»ØËùÑ¡ÏîÄ¿µÄË÷Òý¡£

²ÎÊýÁбí:
/C choices Ö¸¶¨Òª´´½¨µÄÑ¡ÏîÁÐ±í¡£Ä¬ÈÏÁбíÊÇ "YN"¡£

/N ÔÚÌáʾ·ûÖÐÒþ²ØÑ¡ÏîÁÐ±í¡£ÌáʾǰÃæµÄÏûÏ¢µÃµ½ÏÔʾ£¬
Ñ¡ÏîÒÀ¾É´¦ÓÚÆôÓÃ״̬¡£

/CS ÔÊÐíÑ¡Ôñ·Ö´óСдµÄÑ¡Ïî¡£ÔÚĬÈÏÇé¿öÏ£¬Õâ¸ö¹¤¾ß
ÊDz»·Ö´óСдµÄ¡£

/T timeout ×ö³öĬÈÏÑ¡Ôñ֮ǰ£¬ÔÝÍ£µÄÃëÊý¡£¿É½ÓÊܵÄÖµÊÇ´Ó 0
µ½ 9999¡£Èç¹ûÖ¸¶¨ÁË 0£¬¾Í²»»áÓÐÔÝÍ££¬Ä¬ÈÏÑ¡Ïî
»áµÃµ½Ñ¡Ôñ¡£

/D choice ÔÚ nnnn ÃëÖ®ºóÖ¸¶¨Ä¬ÈÏÑ¡Ïî¡£×Ö·û±ØÐëÔÚÓà /C Ñ¡
ÏîÖ¸¶¨µÄÒ»×éÑ¡ÔñÖÐ; ͬʱ£¬±ØÐëÓà /T Ö¸¶¨ nnnn¡£

/M text Ö¸¶¨Ìáʾ֮ǰҪÏÔʾµÄÏûÏ¢¡£Èç¹ûûÓÐÖ¸¶¨£¬¹¤¾ßÖ»
ÏÔʾÌáʾ¡£

/? ÏÔʾ°ïÖúÏûÏ¢¡£

×¢Òâ:
ERRORLEVEL »·¾³±äÁ¿±»ÉèÖÃΪ´ÓÑ¡Ôñ¼¯Ñ¡ÔñµÄ¼üË÷Òý¡£ÁгöµÄµÚÒ»¸öÑ¡
Ôñ·µ»Ø 1£¬µÚ¶þ¸öÑ¡Ôñ·µ»Ø 2£¬µÈµÈ¡£Èç¹ûÓû§°´µÄ¼ü²»ÊÇÓÐЧµÄÑ¡Ôñ£¬
¸Ã¹¤¾ß»á·¢³ö¾¯¸æÏìÉù¡£Èç¹û¸Ã¹¤¾ß¼ì²âµ½´íÎó״̬£¬Ëü»á·µ»Ø 255 µÄ
ERRORLEVEL Öµ¡£Èç¹ûÓû§°´ Ctrl+Break »ò Ctrl+C ¼ü£¬¸Ã¹¤¾ß»á·µ»Ø 0
µÄ ERRORLEVEL Öµ¡£ÔÚÒ»¸öÅú³ÌÐòÖÐʹÓà ERRORLEVEL ²ÎÊýʱ£¬½«²ÎÊý½µ
ÐòÅÅÁС£

ʾÀý:
CHOICE /?
CHOICE /C YNC /M "È·ÈÏÇë°´ Y£¬·ñÇë°´ N£¬»òÕßÈ¡ÏûÇë°´ C¡£"
CHOICE /T 10 /C ync /CS /D y
CHOICE /C ab /M "Ñ¡Ïî 1 ÇëÑ¡Ôñ a£¬Ñ¡Ïî 2 ÇëÑ¡Ôñ b¡£"
CHOICE /C ab /N /M "Ñ¡Ïî 1 ÇëÑ¡Ôñ a£¬Ñ¡Ïî 2 ÇëÑ¡Ôñ b¡£"

==== ±à×¢ ===============================
ÎÒÁгöwin98ÏÂchoiceµÄÓ÷¨°ïÖú, ÒÑ×ÊÇø·Ö

Waits for the user to choose one of a set of choices.
µÈ´ýÓû§Ñ¡ÔñÒ»×é´ýÑ¡×Ö·ûÖеÄÒ»¸ö


CHOICE [/C[:]choices] [/N] [/S] [/T[:]c,nn] [text]

/C[:]choices Specifies allowable keys. Default is YN
Ö¸¶¨ÔÊÐíµÄ°´¼ü(´ýÑ¡×Ö·û), ĬÈÏΪYN
/N Do not display choices and ? at end of prompt string.
²»ÏÔʾÌáʾ×Ö·û´®ÖеÄÎʺźʹýÑ¡×Ö·û
/S Treat choice keys as case sensitive.
´¦Àí´ýÑ¡×Ö·ûʱ´óСдÃô¸Ð
/T[:]c,nn Default choice to c after nn seconds
ÔÚ nn ÃëºóĬÈÏÑ¡Ôñ c
text Prompt string to display
ÒªÏÔʾµÄÌáʾ×Ö·û´®
ERRORLEVEL is set to offset of key user presses in choices.
ERRORLEVEL ±»ÉèÖÃΪÓû§¼üÈëµÄ×Ö·ûÔÚ´ýÑ¡×Ö·ûÖеÄÆ«ÒÆÖµ
Èç¹ûÎÒÔËÐÐÃüÁCHOICE /C YNC /M "È·ÈÏÇë°´ Y£¬·ñÇë°´ N£¬»òÕßÈ¡ÏûÇë°´ C¡£"
ÆÁÄ»ÉÏ»áÏÔʾ£º
È·ÈÏÇë°´ Y£¬·ñÇë°´ N£¬»òÕßÈ¡ÏûÇë°´ C¡£ [Y,N,C]?


Àý£ºtest.batµÄÄÚÈÝÈçÏ£¨×¢Ò⣬ÓÃif errorlevelÅжϷµ»Øֵʱ£¬Òª°´·µ»ØÖµ´Ó¸ßµ½µÍÅÅÁУ©:

@echo off
choice /C dme /M "defrag,mem,end"
if errorlevel 3 goto end
if errorlevel 2 goto mem
if errorlevel 1 goto defrag

:defrag
c:\dos\defrag
goto end

:mem
mem
goto end

:end
echo good bye

´Ë Åú´¦ÀíÔËÐк󣬽«ÏÔʾ"defrag,mem,end[D,M,E]?" £¬Óû§¿ÉÑ¡Ôñd m e £¬È»ºóifÓï¾ä¸ù¾ÝÓû§µÄÑ¡Ôñ×÷³öÅжϣ¬d±íʾִÐÐ±ê ºÅΪdefragµÄ³ÌÐò¶Î£¬m±íʾִÐбêºÅΪmemµÄ³ÌÐò¶Î£¬e±íʾִÐбêºÅΪendµÄ³ÌÐò¶Î£¬Ã¿¸ö³ÌÐò¶Î×îºó¶¼ÒÔgoto end½«³ÌÐòÌøµ½end±êºÅ ´¦£¬È»ºó³ÌÐò½«ÏÔʾgood bye£¬Åú´¦ÀíÔËÐнáÊø¡£

ËÄ¡¢for Ñ­»·ÃüÁֻҪÌõ¼þ·ûºÏ£¬Ëü½«¶à´ÎÖ´ÐÐͬһÃüÁî¡£

Óï·¨£º
¶ÔÒ»×éÎļþÖеÄÿһ¸öÎļþÖ´ÐÐij¸öÌض¨ÃüÁî¡£

FOR %%variable IN (set) DO command [command-parameters]

%%variable Ö¸¶¨Ò»¸öµ¥Ò»×Öĸ¿ÉÌæ»»µÄ²ÎÊý¡£
(set) Ö¸¶¨Ò»¸ö»òÒ»×éÎļþ¡£¿ÉÒÔʹÓÃͨÅä·û¡£
command Ö¸¶¨¶Ôÿ¸öÎļþÖ´ÐеÄÃüÁî¡£
command-parameters
ΪÌض¨ÃüÁîÖ¸¶¨²ÎÊý»òÃüÁîÐпª¹Ø¡£

ÀýÈçÒ»¸öÅú´¦ÀíÎļþÖÐÓÐÒ»ÐÐ:
for %%c in (*.bat *.txt) do type %%c

Ôò¸ÃÃüÁîÐлáÏÔʾµ±Ç°Ä¿Â¼ÏÂËùÓÐÒÔbatºÍtxtΪÀ©Õ¹ÃûµÄÎļþµÄÄÚÈÝ¡£

==== ±à×¢ ===========================================
ÐèÒªÖ¸³öµÄÊÇ, µ±()ÖеÄ×Ö·û´®²¢·Çµ¥¸ö»ò¶à¸öÎļþÃûʱ, Ëü½«µ¥´¿±»µ±×÷×Ö·û´®Ìæ»», Õâ¸öÌØÐÔÔÙ¼ÓÉÏ()ÖпÉÒÔǶÈë¶à¸ö×Ö·û´®µÄÌØÐÔ, ºÜÃ÷ÏÔ for ¿ÉÒÔ±»¿´×÷Ò»ÖÖ±éÀúÐÍÑ­»·.
µ±È», ÔÚ nt/2000/xp/2003 ϵÁеÄÃüÁîÐл·¾³ÖÐ, for ±»¸³ÓèÁ˸ü¶àµÄÌØÐÔ, ʹ֮¿ÉÒÔ·ÖÎöÃüÁîÊä³ö»òÕßÎļþÖеÄ×Ö·û´®, Ò²Óкܶ࿪¹Ø±»ÓÃÓÚÀ©Õ¹ÁËÎļþÌæ»»¹¦ÄÜ.
=======================================================
Åú´¦ÀíʾÀý

1. IF-EXIST

1) Ê×ÏÈÓüÇʱ¾ÔÚC:\½¨Á¢Ò»¸ötest1.batÅú´¦ÀíÎļþ£¬ÎļþÄÚÈÝÈçÏ£º

@echo off
IF EXIST \AUTOEXEC.BAT TYPE \AUTOEXEC.BAT
IF NOT EXIST \AUTOEXEC.BAT ECHO \AUTOEXEC.BAT does not exist


È»ºóÔËÐÐËü£º
C:\>TEST1.BAT

Èç¹ûC:\´æÔÚAUTOEXEC.BATÎļþ£¬ÄÇôËüµÄÄÚÈݾͻᱻÏÔʾ³öÀ´£¬Èç¹û²»´æÔÚ£¬Åú´¦Àí¾Í»áÌáʾÄã¸ÃÎļþ²»´æÔÚ¡£

2) ½Ó×ÅÔÙ½¨Á¢Ò»¸ötest2.batÎļþ£¬ÄÚÈÝÈçÏ£º

@ECHO OFF
IF EXIST \%1 TYPE \%1
IF NOT EXIST \%1 ECHO \%1 does not exist

Ö´ÐÐ:
C:\>TEST2 AUTOEXEC.BAT
¸ÃÃüÁîÔËÐнá¹ûͬÉÏ¡£

˵Ã÷£º
(1) IF EXIST ÊÇÓÃÀ´²âÊÔÎļþÊÇ·ñ´æÔڵģ¬¸ñʽΪ
IF EXIST [·¾¶+ÎļþÃû] ÃüÁî
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