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发表于 2005-5-6 22:10:52
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CMD.EXE 用处也很大的
- Starts a new instance of the Windows command interpreter
- CMD [/A | /U] [/Q] [/D] [/E:ON | /E:OFF] [/F:ON | /F:OFF] [/V:ON | /V:OFF]
- [[/S] [/C | /K] string]
- /C Carries out the command specified by string and then terminates
- /K Carries out the command specified by string but remains
- /S Modifies the treatment of string after /C or /K (see below)
- /Q Turns echo off
- /D Disable execution of AutoRun commands from registry (see below)
- /A Causes the output of internal commands to a pipe or file to be ANSI
- /U Causes the output of internal commands to a pipe or file to be
- Unicode
- /T:fg Sets the foreground/background colors (see COLOR /? for more info)
- /E:ON Enable command extensions (see below)
- /E:OFF Disable command extensions (see below)
- /F:ON Enable file and directory name completion characters (see below)
- /F:OFF Disable file and directory name completion characters (see below)
- /V:ON Enable delayed environment variable expansion using ! as the
- delimiter. For example, /V:ON would allow !var! to expand the
- variable var at execution time. The var syntax expands variables
- at input time, which is quite a different thing when inside of a FOR
- loop.
- /V:OFF Disable delayed environment expansion.
- Note that multiple commands separated by the command separator '&&'
- are accepted for string if surrounded by quotes. Also, for compatibility
- reasons, /X is the same as /E:ON, /Y is the same as /E:OFF and /R is the
- same as /C. Any other switches are ignored.
- If /C or /K is specified, then the remainder of the command line after
- the switch is processed as a command line, where the following logic is
- used to process quote (") characters:
- 1. If all of the following conditions are met, then quote characters
- on the command line are preserved:
- - no /S switch
- - exactly two quote characters
- - no special characters between the two quote characters,
- where special is one of: &<>()@^|
- - there are one or more whitespace characters between the
- the two quote characters
- - the string between the two quote characters is the name
- of an executable file.
- 2. Otherwise, old behavior is to see if the first character is
- a quote character and if so, strip the leading character and
- remove the last quote character on the command line, preserving
- any text after the last quote character.
- If /D was NOT specified on the command line, then when CMD.EXE starts, it
- looks for the following REG_SZ/REG_EXPAND_SZ registry variables, and if
- either or both are present, they are executed first.
- HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\AutoRun
- and/or
- HKEY_CURRENT_USER\Software\Microsoft\Command Processor\AutoRun
- Command Extensions are enabled by default. You may also disable
- extensions for a particular invocation by using the /E:OFF switch. You
- can enable or disable extensions for all invocations of CMD.EXE on a
- machine and/or user logon session by setting either or both of the
- following REG_DWORD values in the registry using REGEDIT.EXE:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\EnableExtensions
- and/or
- HKEY_CURRENT_USER\Software\Microsoft\Command Processor\EnableExtensions
- to either 0x1 or 0x0. The user specific setting takes precedence over
- the machine setting. The command line switches take precedence over the
- registry settings.
- The command extensions involve changes and/or additions to the following
- commands:
- DEL or ERASE
- COLOR
- CD or CHDIR
- MD or MKDIR
- PROMPT
- PUSHD
- POPD
- SET
- SETLOCAL
- ENDLOCAL
- IF
- FOR
- CALL
- SHIFT
- GOTO
- START (also includes changes to external command invocation)
- ASSOC
- FTYPE
- To get specific details, type commandname /? to view the specifics.
- Delayed environment variable expansion is NOT enabled by default. You
- can enable or disable delayed environment variable expansion for a
- particular invocation of CMD.EXE with the /V:ON or /V:OFF switch. You
- can enable or disable delayed expansion for all invocations of CMD.EXE on a
- machine and/or user logon session by setting either or both of the
- following REG_DWORD values in the registry using REGEDIT.EXE:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\DelayedExpansion
- and/or
- HKEY_CURRENT_USER\Software\Microsoft\Command Processor\DelayedExpansion
- to either 0x1 or 0x0. The user specific setting takes precedence over
- the machine setting. The command line switches take precedence over the
- registry settings.
- If delayed environment variable expansion is enabled, then the exclamation
- character can be used to substitute the value of an environment variable
- at execution time.
- You can enable or disable file name completion for a particular
- invocation of CMD.EXE with the /F:ON or /F:OFF switch. You can enable
- or disable completion for all invocations of CMD.EXE on a machine and/or
- user logon session by setting either or both of the following REG_DWORD
- values in the registry using REGEDIT.EXE:
- HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\CompletionChar
- HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\PathCompletionChar
- and/or
- HKEY_CURRENT_USER\Software\Microsoft\Command Processor\CompletionChar
- HKEY_CURRENT_USER\Software\Microsoft\Command Processor\PathCompletionChar
- with the hex value of a control character to use for a particular
- function (e.g. 0x4 is Ctrl-D and 0x6 is Ctrl-F). The user specific
- settings take precedence over the machine settings. The command line
- switches take precedence over the registry settings.
- If completion is enabled with the /F:ON switch, the two control
- characters used are Ctrl-D for directory name completion and Ctrl-F for
- file name completion. To disable a particular completion character in
- the registry, use the value for space (0x20) as it is not a valid
- control character.
- Completion is invoked when you type either of the two control
- characters. The completion function takes the path string to the left
- of the cursor appends a wild card character to it if none is already
- present and builds up a list of paths that match. It then displays the
- first matching path. If no paths match, it just beeps and leaves the
- display alone. Thereafter, repeated pressing of the same control
- character will cycle through the list of matching paths. Pressing the
- Shift key with the control character will move through the list
- backwards. If you edit the line in any way and press the control
- character again, the saved list of matching paths is discarded and a new
- one generated. The same occurs if you switch between file and directory
- name completion. The only difference between the two control characters
- is the file completion character matches both file and directory names,
- while the directory completion character only matches directory names.
- If file completion is used on any of the built in directory commands
- (CD, MD or RD) then directory completion is assumed.
- The completion code deals correctly with file names that contain spaces
- or other special characters by placing quotes around the matching path.
- Also, if you back up, then invoke completion from within a line, the
- text to the right of the cursor at the point completion was invoked is
- discarded.
- The special characters that require quotes are:
- <space>
- &()[]{}^=;!'+,`~
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发表于 2005-5-6 15:22:08