STDIN

0

键盘输入

STDOUT

1

输出

STDERR

2

错误输出

UNDEFINED

3-9

有进程决定的文件句柄

>  

输出重定向，可以是文件名，空设备 nul, 打印机 prn, 该操作符左端默认的文件句柄是 1

<  

输入重定向， 该操作符左端默认的文件句柄是 0

>>  

追加输出操作符，该操作符左端默认的文件句柄是 1

>&

输出重定向到另外一个文件句柄，该操作符左端默认的文件句柄是 1

<&

输入重定向到另外一个文件句柄，该操作符左端默认的文件句柄是 0

|

管道操作符

&

<Command1>  & <Command2>

连接统一行上的两个命令

&&

<Command1>  && <Command2>

只有当第一个命令执行成功后才执行第二个命令（由命令的错误代码决定）

||

<Command1>  || <Command2>

只有当第一个命令执行失败后才执行第二个命令（由命令的错误代码大于 0 决定）

()

( < Command1>  & <Command2>)

用来做复合语句，可嵌套

;   ,

<Command1>  <Parameter1>;<Parameter2>

分割命令行参数 .

%ALLUSERSPROFILE%

Local

Returns the location of the All Users Profile.

%APPDATA%

Local

Returns the location where applications store data by default.

%CD%

Local

Returns the current directory string.

%CMDCMDLINE%

Local

Returns the exact command line used to start the current Cmd.exe.

%CMDEXTVERSION%

System

Returns the version number of the current Command Processor Extensions.

%COMPUTERNAME%

System

Returns the name of the computer.

%COMSPEC%

System

Returns the exact path to the command shell executable.

%DATE%

System

Returns the current date. Uses the same format as the date /t command.

%ERRORLEVEL%

System

Returns the error code of the most recently used command. A non zero value usually indicates an error.

%HOMEDRIVE%

System

Returns which local workstation drive letter is connected to the user's home directory. Set based on the value of the home directory. The user's home directory is specified in Local Users and Groups.

%HOMEPATH%

System

Returns the full path of the user's home directory. Set based on the value of the home directory. The user's home directory is specified in Local Users and Groups.

%HOMESHARE%

System

Returns the network path to the user's shared home directory. Set based on the value of the home directory. The user's home directory is specified in Local Users and Groups.

%LOGONSERVER%

Local

Returns the name of the domain controller that validated the current logon session.

%NUMBER_OF_PROCESSORS%

System

Specifies the number of processors installed on the computer.

%OS%

System

Returns the operating system name. Windows 2000 displays the operating system as Windows_NT.

%PATH%

System

Specifies the search path for executable files.

%PATHEXT%

System

Returns a list of the file extensions that the operating system considers to be executable.

%PROCESSOR_ARCHITECTURE%

System

Returns the chip architecture of the processor. Values: x86 or IA64 ( Itanium –based).

%PROCESSOR_IDENTFIER%

System

Returns a description of the processor.

%PROCESSOR_LEVEL%

System

Returns the model number of the processor installed on the computer.

%PROCESSOR_REVISION%

System

Returns the revision number of the processor.

%PROMPT%

Local

Returns the command prompt settings for the current interpreter. Generated by Cmd.exe.

%RANDOM%

System

Returns a random decimal number between 0 and 32767. Generated by Cmd.exe.

%SYSTEMDRIVE%

System

Returns the drive containing the Windows server operating system root directory (that is, the system root).

%SYSTEMROOT%

System

Returns the location of the Windows server operating system root directory.

%TEMP% and %TMP%

System and User

Returns the default temporary directories that are used by applications available to users who are currently logged on. Some applications require TEMP and others require TMP.

%TIME%

System

Returns the current time. Uses the same format as the time /t command.

%USERDOMAIN%

Local

Returns the name of the domain that contains the user's account.

%USERNAME%

Local

Returns the name of the user who is currently logged on.

%USERPROFILE%

Local

Returns the location of the profile for the current user.

%WINDIR%

System

Returns the location of the operating system directory.